Okay, a few dollars and craigslist and here are all the parts I need! Two engine choices, several tires, seats, and more.

The scooter drivetrain is interesting. I guess every 50 cc scooter made uses the same engine designed by Honda in the 60's. Made in China. Parts are cheap. Found another car built on a scooter called the Zoe Zipper. Would like some close ups of the chassis, but cannot find any. Looks like it's built like the Scoot Car aka GoCar I drove last week. But only one seat.

Getting close! Stay tuned.