You're robot is awesome and a million times better than mine! Mine is a chopping board with a 50cm length of inch box section bolted to it! I built the whole thing in the end of the kitchen on a work mate and the back step (much to the mrs' disgust). Just get it running and we can have our own bash around class! lol. Please look at my robots there so rubbish but such a giggle to drive! My drive motors sit an inch out of line with each other and at different angles! I have plans to hammer a pieces of ally into a top cover and to get to one of these non spinner events I make stuff from bits I find randomly!