Best I can remember Bob Douglas at Rod End Supply built such a car in the late 80's. Thought it had a Yamaha engine in it. Like several Yamaha's of that time it was shaft drive and he simply turned it and put the sprocket on the end of the 90 Degree drive on the motor. It was a pretty little car but the Yamaha was a little under powered. I would give him a call and see if he knows anything about it.

Honest Dad himself