Quantity   Component name
1 × Parallax Propeller camera gimbal board This board, produced by HoverFly, was originally meant to control servo-based camera gimbals.. It includes an ITG3200 digital gyro ADXL 345 accelerometer, and a magnetometer (unused).
2 × 3 Cell, 5Ah lithium polymer battery
1 × 2x32A Sabertooth DC motor controller
2 × 280W, 24V brushed electric scooter motor United Motor MY1016, with chain or belt pinion, depending on your drive choice.
1 × 3/4" square steel frame. I had to teach myself to weld. It's not pretty.
2 × Rear electric scooter rim / tire 8" rims for 12" tires, like these: http://www.partsforscooters.com/All-Scooter-Parts/Rear-Wheels