... Looking at the Q80 picture in the Hacker catalogue; should be possible to make an rear support...
EG: carbonplate2-3mm thick ( approx 3cm dia ), drill 5 holes in, put carbon rods in the holes,isolated by fuelhoses, fit everything in the center of the "spoke-space" ... rest of support to the fuse-frame could be the same as the C50... Hmm...
Just some thoughts, hard to say without the motor close-up... Anyway, would be interesting to try this motor, if i did not have two of the C50 already
Kjell Olav