De posse da ISO com Xfce, que vai ser usada como template, vamos remasterizar.
Usei meus métodos de remasterização simplificada e incremental, que detalhei em meus artigos anteriores (veja 
, links citados).
Tomei por base meus arquivos antigos (.spec) de minhas antigas remasterizações de Sabayon com KDE e GNOME 2, e usando os arquivos novos de Molecule (".spec" e ".common") que o time de desenvolvedores Sabayon usa para remasterizar as ISOs "Daily":
Obtive toda a informação que precisava.
Partindo do "xfce.spec", o combinei com os specs originais do LXDE, MATE e E17, e adicionei 
 e muitos outros pacotes que gosto e uso, e criei o seguinte arquivo final (ati.spec) que controla a remasterização.
Se você quiser remasterizar, não tem segredo. Edite o arquivo abaixo e na sessão 
, coloque os pacotes que deseje adicionar, de qualquer ambiente gráfico. As dependências serão gerenciadas automaticamente pelo Molecule e pelo Entropy. Pode deixar pacotes com nomes dobrados ou duplicados que o sistema pula.
# Sabayon Linux 10, 64 Bits, remasterized for ATI. Molecule remaster spec file, made by albfneto, Brazil.
# Modified from  code and text of the default SPEC and COMMON Files, from Fabio Erculiani, Italy and the Sabayon Team
    
# The aim of this spec file is to add arbitrary applications & misc stuff
      #  to  an  already  built  ISO  i
mage  via  scripting  (providing  hooks  that  call
      #  user-defined  scripts).
      #  squashfs,  mkisofs  needed
# Define an alternative execution strategy, in this case, the value must be
      #  "iso_remaster"
      execution_strategy:  iso_remaster
# 64 Bits ISO, not necessary. Uncomment only for 32 Bits. 
# pre chroot command, example, for 32bit chroots on 64bit system, you always
      #  have  to  append  "linux32"  this 
 is  useful  for  inner_chroot_script
      #  prechroot:  linux32
# Path to source ISO file (MANDATORY)
    source_iso:  /molecula/ATI/sabayon.iso
# Extra mkisofs parameters, perhaps something to include/use your bootloader
    extra_mkisofs_parameters:  -b  isolinux/isolinux.bin  -
c  isolinux/boot.cat
 
# Destination directory for the ISO image path (MANDATORY)
    destination_iso_directory:  /molecula/ATI
# Destination ISO image name, call whatever you want.iso, not mandatory
destination_iso_image_name: Sabayon_Linux-for_ATI.iso
# Output iso image title
    iso_title:  Sabayon_Linux-for_ATI
# Alternative ISO file mount command (default is: mount -o loop -t iso9660)
    #  iso_mounter:
# Alternative ISO umounter command (default is: umount)
    #  iso_umounter:
# Adicione aqui pacotes que deseja tirar. Removendo Caribou. Caribou é um pacote
# de acessibilidade que costuma causar problemas. Seu Firefox fica falando... 
# List of packages that would be removed from chrooted system (comma separated)
    packages_to_remove:  caribou  
# Comando modificado, evitando tirar dependencias:
# Custom shell call to packages removal (default is: equo remove)
custom_packages_remove_cmd: equo --nodeps  remove 
# List of packages that would be added from chrooted system (comma separated)
    packages_to_add:
# Remasteriza XFCE:
      @X,
      @fluxbox,
      @gst-plugins,
      @gst-plugins-extra,
      @wireless,
      @xfce,
      app-admin/rigo,
      app-arch/file-roller,
      app-arch/unrar,
      app-crypt/gnupg,
      app-crypt/pinentry-gtk2,
      app-dicts/aspell-en,
      app-dicts/aspell-pt_BR
      app-dicts/aspell-pt,
      app-dicts/myspell-pt,
      app-dicts/myspell-en,
      app-dicts/myspell-pt_BR,
      app-emulation/virtualbox-guest-additions,
      app-emulation/wine,
      app-misc/anaconda-runtime-gui,
      app-misc/gnote,
      app-misc/sabayon-music,
      app-office/libreoffice,
      app-office/libreoffice-l10n-pt_BR,
      app-text/epdfview,
      app-text/pastebunz,
      dev-java/icedtea-bin,
      games-misc/cowsay,
      gnome-extra/nm-applet-gtk2,
      gnome-extra/polkit-gnome,
      media-fonts/corefonts,
      media-fonts/dejavu,
      media-fonts/ttf-bitstream-vera,
      media-gfx/gimp,
      media-gfx/ristretto,
      media-gfx/shotwell,
      media-libs/libdvdcss,
      media-libs/libdvdnav,
      media-libs/libdvdplay,
      media-libs/libdvdread,
      media-sound/exaile,
      media-video/totem,
      net-dialup/globespan-adsl,
      net-dialup/gnome-ppp,
      net-dialup/ppp,
      net-dialup/rp-pppoe,
      net-firewall/ufw-frontends,
      net-im/pidgin,
      net-irc/xchat,
      net-p2p/transmission-gtk,
      net-print/cups,
      net-wireless/bluez,
      net-wireless/bluez-firmware,
      net-wireless/bluez-hcidump,
      sys-apps/gpu-detector,
      sys-auth/consolekit,
      sys-block/gparted,
      sys-block/parted,
      sys-fs/ntfs3g,
      sys-fs/zfs,
      sys-power/cpufrequtils,
      www-client/midori,
      www-plugins/adobe-flash,
      x11-drivers/ati-drivers,
      x11-drivers/xf86-video-ati
      x11-drivers/xf86-video-virtualbox,
      x11-libs/gksu,
      x11-libs/vdpau-video,
      x11-libs/xvba-video,
      x11-misc/magneto-gtk,
      x11-misc/xvkbd,
      x11-terms/terminal,
      x11-terms/xterm,
      x11-themes/equinox-themes,
      x11-themes/gnome-themes-standard,
      x11-themes/gtk-engines:2,
      x11-themes/iottinka-artwork,
      x11-themes/tango-icon-theme,
      xfce-base/xfce4-panel,
      xfce-extra/tumbler,
      xfce-extra/xfce4-clipman-plugin,
      xfce-extra/xfce4-mixer,
      xfce-extra/xfce4-notifyd,
      xfce-extra/xfce4-places-plugin,
      xfce-extra/xfce4-screenshooter,
# Remasteriza  MATE:
      app-admin/rigo,
      app-misc/sabayon-skel,
      app-crypt/gnupg,
      app-crypt/pinentry-gtk2,
      app-emulation/virtualbox-guest-additions,
      app-misc/anaconda-runtime-gui,
      app-text/pastebunz,
      gnome-extra/nm-applet-gtk2,
      lxde-base/lxdm,
      mate-base/mate,
      media-fonts/ttf-bitstream-vera,
      media-fonts/dejavu,
      media-fonts/corefonts,
      media-plugins/alsa-plugins,
      media-sound/audacious,
      net-dialup/rp-pppoe,
      net-irc/xchat,
      net-p2p/transmission-gtk,
      x11-libs/gksu,
      x11-terms/xterm,
      sys-apps/gnome-disk-utility,
      sys-apps/gpu-detector,
      sys-auth/consolekit,
      sys-block/parted,
      sys-fs/ntfs3g,
      sys-fs/zfs,
      sys-power/cpufrequtils,
      x11-drivers/xf86-video-virtualbox,
      x11-themes/equinox-themes,
      x11-themes/gnome-themes-standard,
      x11-themes/gtk-engines:2,
# Remasteriza LXDE:
      @lxde,
      app-admin/rigo,
      app-arch/xarchiver,
      app-crypt/gnupg,
      app-crypt/pinentry-gtk2,
      app-editors/leafpad,
      app-emulation/virtualbox-guest-additions,
      app-misc/anaconda-runtime-gui,
      app-office/abiword,
      app-office/gnumeric,
      app-text/epdfview,
      app-text/pastebunz,
      games-misc/cowsay,
      gnome-extra/nm-applet-gtk2,
      lxde-base/lxpolkit,
      media-fonts/ttf-bitstream-vera,
      media-fonts/dejavu,
      media-fonts/corefonts,
      media-plugins/alsa-plugins,
      media-sound/audacious,
      net-dialup/rp-pppoe,
      net-irc/xchat,
      net-p2p/transmission-gtk,
      x11-libs/gksu,
      x11-terms/xterm,
      sys-apps/gnome-disk-utility,
      sys-apps/gpu-detector,
      sys-auth/consolekit,
      sys-block/parted,
      sys-fs/ntfs3g,
      sys-fs/zfs,
      sys-power/cpufrequtils,
      x11-drivers/ati-drivers,
      x11-drivers/xf86-video-virtualbox,
      x11-themes/equinox-themes,
      x11-themes/gtk-engines:2,
      xfce-extra/xfce4-notifyd,
# Remasteriza  E17:
      @e17,
      app-admin/rigo,
      app-crypt/gnupg,
      app-crypt/pinentry-gtk2,
      app-emulation/virtualbox-guest-additions,
      app-editors/leafpad,
      app-misc/anaconda-runtime-gui,
      app-text/epdfview,
      app-text/pastebunz,
      dev-libs/fribidi,
      games-misc/cowsay,
      gnome-extra/nm-applet-gtk2,
      lxde-base/lxdm,
      lxde-base/lxpolkit,
      lxde-base/lxterminal,
      media-fonts/corefonts,
      media-fonts/dejavu,
      media-fonts/ttf-bitstream-vera,
      media-gfx/ristretto,
      media-plugins/alsa-plugins,
      media-sound/xnoise,
      net-dialup/rp-pppoe,
      net-im/pidgin,
      net-irc/xchat,
      net-p2p/transmission-gtk,
      sys-apps/gnome-disk-utility,
      sys-apps/gpu-detector,
      sys-auth/consolekit,
      sys-block/parted,
      sys-fs/ntfs3g,
      sys-fs/zfs,
      sys-power/cpufrequtils,
      www-client/midori,
      x11-drivers/ati-drivers,
      x11-drivers/xf86-video-virtualbox,
      x11-libs/gksu,
      x11-terms/xterm,
      x11-themes/equinox-themes,
      x11-themes/gtk-engines-xfce,
      x11-themes/tango-icon-theme,
      x11-themes/gnome-icon-theme,
      x11-themes/gtk-engines:2,
      x11-themes/sabayon-artwork-gnome,
# Remasteriza Window Maker:
windowmaker, windowmaker-themes, wmakerconf, wmMatrix, wmpop3, wmsound, wmlaptop, wmctrl, wmCalClock, wmDownload, wmMoonClock, 
wmSpaceWeather, wmSun, wmacpi, wmacpiload-ac, wmacpimon, wmail, wmapm, wmapmload, wmapi, wmbatteries, wmbiff, wmbinclock, wmbio, 
wmblob, wmbluecpu, wmbutton, wmcalc, wmcalendar, wmcdplay, wmclipist, wmclock, wmclockmon, wmcoincoin, wmcmu, wmcp, wmcpu, wmcpuload, 
wmcube, wmdate, wmdf, wmdl, wmdiskmon, wmdots ,wmdrawer,wmfishtime, wmfortune, wmfrog,wmfsm, wmget, wmgrabimage, wmhdlop, wmifinfo, 
wmminet, wmitime, wmmix, wmload, wmlpq, wmmemfree, wmmemload, wmmemmon, wmmenu, system-confi-keyboard, wmmisc, wmmp3, wmmsg, 
wmmnd, wmmldonkey, wmmixer, wmnet, wmnetload, wmnetselect, wmpager, wmpeople, wmpop3, wmpop3lb, wmrack, wmrecord, wmsmixer, 
wmpower, wmppp, wmpiki ,wmpinboard, wmsawallow, wmsysmon, wmsystray, wmxres, wmtime, wmtimer, wmwifi, wmwork, wmxkb, wmtop, wmtz, 
wmupmon, wmwave, wmweather, 
# Remasteriza Razorqt:
razorqt-meta, razorqt-power, razorqt-runner,razorqt-session, razorqt-policykit, 
razorqt-panel, razorqt-openssh-askpass, razorqt-notifications,razorqt-lightdm-greeter,razorqt-libs,razorqt-kbshortcuts,
razorqt-desktop, razorqt-data,razorqt-config, razorqt-autosuspend,razorqt-appswitcher,
####"OUTROS"####
# Coloque aqui, um por um e separado por vírgulas, os pacotes que deseja adicionar à sua ISO, remova os que não quer:
xdm, twm,pidgin,emesene,mldonkey,amuleadu, opera, seamonkey, firefox,mrxvt,eterm, bleachbit, clementine, exaile,tilda,wicd,k3b,gparted, 
xfburn,mate-terminal, leafpad,caja,terminator, radiotray,xf86-video-v4l,xf86-video-vesa,xf86-video-nv, mate-notification-daemon,cheese, 
hplip,foomatic,gutenprint, alltray, notification-daemon,libdrm, openbox, blackbox, compiz, compiz-fusion, simple-ccsm, ccsm, compiz-plugins-main, 
compiz-plugins-extra, lightwm, gdm, lxdm, keybinder, compiz-plugins-unsupported,fusion-icon,compiz-bcop, compizconfig-python, compizconfig-
backend-gconf,libcompizconfig,mate-file-archiver, mate-text-editor,setxkbmap, mesa,glm, mlocate, sulfur,terminal,lxterminal,eterm, mrxvt, 
pulseaudio, pavucontrol,l gst-plugins-pulse, gnome-impulse, pavumeter, paprefs, paman, padevchooser, alsa-core, alsa-mixer, pyalsa, pylasaaudio, 
alsalib, libclalsadrv, alsa-plugins, alsaequal, gst-plugins-alsa, alsa-headers, alsa-tools, alsa-utils, alsamixer-app, alsamixergui, alsaplayer, phonon, 
pygtk, xine-ui, gstreamer,libmateweather,libmate,libmatecanvas, libmatekbd,libmatekeyring,libmateui, mate-conf, mate-control-center, mate-menus, 
mate-desktop,mate-mime-data,mate-panel,aria2, curl, axel, eatmonkey, eix, git, cvs, subversion,make, automake,autoconf,gcc,gcc-
config,esearch,pidgin,emerald, mirrorselect, autounmask, emerald-themes,xfwm4, xfwm4-themes,icewm, icewm-
themes,icewmcp,iceicons,madwifi,nano,filezilla,
# Re-instala e atualiza o Kernel e os drivers proprietários ATI:
 linux-sabayon, ati-drivers, ati-userspace, linux-firmware, genkernel, sabayon-sources, sabayon-headers
# Custom shell call to packages add (default is: equo install)
    # custom_packages_add_cmd:
# Custom command for updating repositories (default is: equo update)
    #  repositories_update_cmd:
# Determine whether repositories update should be run (if packages_to_add is set)
    #  
(default  is:  no),  values  are:  yes,  no.
    execute_repositories_update:  yes
  
# Directories to remove completely (comma separated)
    #  paths_to_remove:
# Directories to empty (comma separated)
    #  paths_to_empty:
 
Crie este arquivo (ati.spec) e o salve na pasta onde vai fazer a remasterização. No nosso exemplo, é 
Copie e cole as linhas acima e salve como "ati.spec", na mesma pasta.
Resumindo: Adicione os pacotes que quiser e crie o arquivo "ati.spec", na mesma pasta da remasterização.