This is a VERY basic approach to making a cheep skateboard without having to know ALL of the mechanics involved. I.e. mounting the motor, the chain linkage, frame, brakes, etc; all of that is pre-made into the scooter you will use. The only additional parts I bought were: 2-9" MBS front wheels, MBS front truck, aluminum for the deck, new batteries, some cheep acrylic for the battery box, scratch tape, and misc nuts and bolts from Home Depot.
Here's a video of my buddy riding the finished skateboard down the street.
Top speed is approx: 15-21mph