Sounds awesome we're doing the same stuff. The nunchuch has 4 wires. There's a way to use less than that? But anyway is not a big issue because the arduino is going to be on surface. Plus I'm going to use the joystick too. My concert right now is the camera. I'm doing some research (I don't know much about electronic) and found out about RF cameras instead of webcams. If I'm not mistaken webcams use 4 cables (plus all the complications about distances) Instead I'm thinking and I don't know if possible, to use RF camera and use 1 cable like "antenna" to the sub. Of course I'm going to get an external video card to connect this to the laptop. What do you think about this?
But also like your idea about the arduino in the sub and using only 2 wires. My problem is still don't know how to make the PC and the arduino "talk" in real time But sounds good