This is a rugged chassis made of 1/8" thick aluminum that is cut to the width required by the 4" mecanum wheels. The aluminum is cut with our CNC plasma cutter for and exact fit-up and welded. The chassis accepts outboard bearings to take the wheel loads.
We have a bunch of power supplies laying around. This is a bag of 5 randomly selected power supplies (wall warts). 110VAC input. About 6 inches of wire with no ends. If you need a power supply (wall wart), you can't beat this deal.