I've got one on my list.
Already got parts for it too. It ain't gonna have pedals, but it's gonna be street legal in CA
•Section 406(a) VC refers to a moped or motorized bicycle as any two or three wheeled device having fully operative pedals for propulsion by human power, or having no pedals if powered solely by electrical energy, has an automatic transmission, and a motor which produces less than 2 gross brake horsepower and is capable of propelling the device at a maximum speed of not more than 30 miles per hour on level ground.
It's a mini bike frame I got off ebay. Also have controller, batteries, motor (2 HP series wound DC winch motor) and a bunch of other stuff.
This is gonna need some serious fabrication though and a lotta torch work. I am waiting for cooler weather.