The base is almost ready to move! Mount the motors to the frame. Then attach the gears and wheels to the frame. Using the VEX parts made this simple for me, but it boils down to three shafts for each side, one for each wheel and the one driven by the motor. I used gears to help add torque so the wheels wouldn't slip. After adding the wheels, you can also iron out the exact height the magnet will need to be mounted at.