Yeah at the moment its just spaced with washers, that may be a future change, but atm the main problem is weight. its going to be hugely over weight. each wheel pod is going to weigh more than 4.5 kilos! and so we only have 4 kilos for batteries electronics, a weapon and a frame, so we need to loose like a kilo and a half from each wheel pod, to get it all in! I think it is quiet easily achievable, just a lot of holes, and were replacing the wheels as including the sprocket, they weigh over a kilo each!