Thanks guys. Yeah we're pretty happy with it!

LiPos may end up being a necessity, but I think we'll get it in weight with the NiMHs. They may start to struggle to put the power out if all 5 motors are blazing at once, so we'll see.

The sides will be 10mm HDPE. They should be pretty solidly mounted (across 4 points; front shaft, chocks between the wheels and a bolt at the back), so hopefully they'll just get slashed instead of ripped off!