I like it alot, especially the way each side has its catamaran wheel setup (never was partial to rectangles). Im wondering about pneumatics though. I try to stay away from them because of weight, lack of fine control, air leakage, (even on the best system you get this), and the potntial damage of a tube getting snagged. Unless their is a specific reason you want to use them i would say stick to motors. Is it possible to do a close up of the wheel assembly? I would love to see it!
Nice work.