[BrianG]

No, that motor does have three wires, the other one is just hidden. All current brushless motors have three main power wires since they are three phase A/C motors.

Yup, that's almost all the electronics you need; don't forget the radio. :)

Obviously, you'll also have to come up with a custom motor mount and a way to mount the batteries and the electronics.

If you onyl get one pinion, I'd get the 14T. I would still get the three different spurs so you have some gearing options.