I've heard that someone on this forum stuck a MVVS 1.6 gas (or was it an RCS 1.4) into a UCD, but remember part of awe-inspiring 3D performance has to do with weight and wing loading (and less is definitely more for 3D). I'd look into something with greater wing area like this for your 1.6.

Actually I think anything sub 11.5lbs dry with the 1.6 would have tremendous 3D performance. I'm thinking about the new lighter Ultra-Stick (1.20 sized) myself. Would allow me to put the tuned pipe on as well...