I am trying to do something similar, but is there no way to boot a 5.4 iso file directly like you can Ubuntu 10.10 or System Rescue CD? Here are three Grub 2 entries, One for System Rescue and Ubuntu that works and the latest attempt to boot a Sabayon 5 is that doesn't...
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menuentry "SystemRescueCd" {
loopback loop /systemrescuecd.iso
linux (loop)/isolinux/rescuecd isoloop=/systemrescuecd.iso setkmap=us docache dostartx
initrd (loop)/isolinux/initram.igz
}
menuentry "Ubuntu 10.10 Desktop ISO amd64" {
loopback loop /ubuntu-x64.iso
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu-x64.iso noeject noprompt splash --
initrd (loop)/casper/initrd.lz
}
menuentry "Sabayon Linux 5.4 KDE ISO" {
search --no-floppy --fs-uuid --set 7c59-3b96
loopback loop /sabayon5.iso
linux (loop)/boot/sabayon root=/dev/ram0 initrd=/boot/sabayon/sabayon.igz init=/linuxrc cdroot doslowusb looptype=squashfs max_loop=64 loop=/livecd.squashfs splash=silent,theme:sabayon CONSOLE=/dev/tty1 quiet --
initrd (loop)/boot/sabayon.igz
}
It does the initial load, but then can't find the image or find the root fs? Any tips.
I think I may boot a Live CD and poke around for some locations to see what I can find...but, maybe one of the packagers might read this and give me some tips...

I really want to use Grub 2 to set these up and plan to sell them to give folks a chance to try Sabayon!!!