hello xordan,
i don't know for the official ebuild,
i don't think one big ebuild is the good way to do, i was thinking about 3 ebuilds crystalspace-ps, cel-ps and planeshift
i don't think downloading and compiling 3 softs in one ebuilds is the good gentoo way to do,
i will be easier for users to install 'emerge planeshift' to make it works but ebuilds don't work that way (if i'm right, but i can be wrong

and if you release a minor fix for one you will have to rebuild the 3 and that tooks a very very long time to build CS/CEL now
but i still open to every advice
see you soon
loux.thefuture