lilo,
i'm glade your trying to use hard masked ebuilds but did you try the "official" ones first ? i mean 26286 for CS and 2591 for CEL. If you don't, you should really try them before using newer unstable one.
I'm currently adding some KEYWORDS to them : "doc" to enable/disable documentation of CS/CEL because not a lot need them

and "maxoptimization" to enable more optimization like -O3 for example,
so my first advice is : unmerge all (CS/CEL/PS/PS-art) then erase folder /opt/planeshift
and try emerging "officials" ebuilds CS-ps(26286), CEL(2591), PS(0.3.018-r5) and PS-art
i hope it will works
see you
loux