[JesseK]

Excellent progress! This is a great first iteration.

The next step is to attach a front/rear bumper and pick up a game piece with it. You may find that Bryan's concern is very valid from both a legality perspective and tube acquisition perspective.

If you gear down that arm a bit more, you will have more control as it comes down (preventing it from slamming). It looked like 2 window motors powered the rotary joint? In that case, you might need to add another sprocket stage.