My son and I have just finished the mBot Rover and it is awesome. So next we want to refurbish an old R2D2 toy he had that is no longer operational and replace the micro controller with an arduino. It has a total of only three motors. two for the legs and one for the head to rotate. In our imagination we can see all kinds of sensors on this platform while maintaining the original R2D2 looks and configuration. We are obviously newbies however he has taken to this like a duck to water. So any suggestions would be great. Like a board that can support the motors and sensor array you would expect R2 to have.