the basic bike is prety simple, i laced strummy/archer drum brake hubs into 24" rims and added 3" wide tires. built a wooden frame jig and made the fram from mild steel tubing, tig welded. the basic design of the fram is i copied a 1975 yamah bmx bike, just up scaled it a little. the forks are nos for a 1965 suzuki K10, lot of people selling them on the web for $35. the pipe is from a moped, had to cut it andturn some joints, then reweld it and have it chromed. the body is fiberglass, i made a foam blank and layed it up. the rear shocks are for an old mini bike. i have about a 1000 bucks in parts and around 80 hours into it. the engine kits can be found just about anywhere, like ebay, they come with all the parts needed to motorize a bike, engine, throttle, chain & sprockets. there about $150. prety ez to put one together.