Models I've got on the list to mock up:
A complete Ark Angel set (going to make each to the same scale, so you get the effect of the taru next to the galka). I think it would make a really cool long-term project.
Just about any NPC or PC gear combination can be done, it's just a matter of how complex. I've got the model extracted for Vrtra, but it's bloody colossal. The initial unfolding looks like that GLaDOS unfold on /po/ the other day. Scary o_O