SM, what about 2 rods going from the frame to the end of the tail or adding a horizontal fin and the rods go to that to keep the boom from twisting? Perhaps some flat carbon to use as rods and if you can find it wide enough make a carbon support post for the upwards fin/mount for the tail motor? [sm=idea.gif]
like you said - just some thoughts.

You know, that setup would save on tail fin strikes some wouldn't it.