A mate of mine wants to build one of these lightweight kit cars from scratch. The three wheeled things you sometimes see about. Best thing I can think it sounds like is a home made Ariel Atom but with only three wheels. He was asking me what bike engines I thought would be good but could not think past a Gixer WR 1100 engine like the hill climb boys use. He wondered about a v twin 1000. Anyone have any thoughts on suitability of any bike engines in relation to one of these ultra lightweight three wheelers? Any thoughts much appriciated..