Here's a video of my buddy riding the finished skateboard down the street.
Top speed is approx: 15-21mph
Step 1: Find an Old Scooter
Step 2: Strip it Bare
The materials you will salvage from the previous scooter are: the steel frame and shocks, the back wheel and chain linkage, the motor(mine was 1000W), the motor controller, the disc brake system, & throttle control from the handlebar. You can test the batteries, but usually they're bad and should be replaced. This picture shows the remaining frame after I stripped everything off. Nothing was more difficult than unscrewing several screws, except the vertical steel piece welded to the frame.(it supported the handle bars and LED display) I took a sawzall to it and it came off very easy.
Step 3: Find a Suitable Deck Material
I found four or five aluminum sheets at the local recycling scrap metal yard; they were almost the perfect size for the deck. The metal yard charged me around $20 for the material. Next, I took them to a local company that builds cotton gins and they were nice enough to offer me the service of their awesome laser cutter. I fastened it to the scooter frame with 3 bolts on each side and two in the front.