[robot180]

This idea sounds perfectly legal, I think. I would just be careful and maybe prototype your idea before spending a long time building it, because it has a good chance of not working. Also, you don't have much experience with doing this, I think. It sounds like your robot would fall over due to the weight of the arm and the maximum size of the base of your robot. Also, it might be hard to find a way to fit this arm device, a hopper-type thing for holding the balls, an electrical system, a chasis, and four wheels or whatever in the envolope. Actually, it would be easy, but not one that holds enough balls that makes it worth it. I am probably wrong though.

Last year was my first year, so I missed ball collecting, only bin collecting. Bins were much easier to deal with, I think.