[golf_cart_john]

Don't forget that wood is a very good option. Over the past 4 years, my team has made 2 robots with aluminum frames and 2 robots with wooden frames. The 2 with aluminum frames lost miserably. The 2 with wooden frames were our pride and joy, and played very well. The success level may just be coincidence, but we definitely did well with wood. Our team found some 9-layer plywood that works real well.