Well the goal was to combine the best of both worlds, I have tried sabayon and as a long time Gentoo user(use funtoo, now as I prefer the core to gentoo's core system) I was kinda dissapointed and how sabayon handled portage, or I guess could be my fault and going and optimizing the make.conf perfectly to my hardare.
Reason why I want entropy is because compiling mate, gnome, kde or any package that really is not part of the base system doesn't need to be compiled from source. I do see that entropy 171 is in funtoo's portage tree officially(surprised actually...)
The goal was also to create a funtoo/sabayon hybrid where portage and entropy work perfectly, sabayon is a great distro and works great however is not really recommended if your want to use portage even though it is there. I also see that portage was stuck in 2009, kinda thought portage would have been a snapshot of when 10 came out.
If I succeed I will post a tutorial completely, including LVM(it's been ages since I've used it since btrfs). Btrfs is the filesystem that I use, zfs is preferred however is actually just as unstable as btrfs which actually if taken propper care of and the use of external drives (for everything, which is a recommended practice) only keep your base system on your hard drives and with your daily apps all your work should be on flash drives or stored on servers.
I did find "Install from a working system" and does explain what I want in more detail.
The tutorial should only be followed if you want to really use portage along side entropy for binary packages and know how to maintain the system. If you want the opposite, stick with sabayon but from my experience portage is broken once your sync and update portage as it can no longer find the "C" compiler but works perfectly BEFORE you sync and update portage.
I would actually like to see sabayon use Funtoo's portage tree as it usually is a bit more up to date in packages, gentoo does get them but maybe a few days or a week slower.