The Mongoose has given me a lot of parts to reuse. I used the rear frame, rear wheel, electric motor, battery and controls on my first trike. I used the 2 disk brakes from the front wheels on my Amped Up Warrior which is detailed in another thread.
That left me with another rear frame, two front forks, motor, battery, one rear wheel and two front wheels. The wheels are 48 spoke BMX style. The axles on the front wheels are too small to be supported from one side so I decided to use the front forks to support them from both sides. Here are some pictures of the design.