cool, see my wife just got back from Iraq and i haven't told her about the trike, so I'm building my friend a cart (traditional 4 wheels) with the same engine, and what I'll do is put the secondary pulley onto the live axle to save time.
tell me what you guys think about this, i plan on making the frame (the "base" of it) out of 1-2" steel threaded pipe with 90* angle pieces on the corners. from there (the back of it) I'm going to put on a swing arm, and build a roll cage out of 1x1 square tubing to mount the swing arms shocks to. FYI i will be welding around the threads, as i see that to be a weak point as the pipe is thinner there.