Love these. Always good to pass on the urge to cruise. Only thing I would do different with projects like these is scale them up a bit so I can fit. Make the seat/pedal adjust to the little guys/gals so they can grow into it. Then when they get older they may want to remove the hood and swap in some alky burnin ex-pro go cart motor they find on the HAMB.
I’m using a legend pride mobility scooter. We got it from a scrap yard for 10 bucks. The whole drivetrain assembly fits under the car. I split the aluminum wheels and mounted a steel rim on the outside.