It looks really cool!
I've never thought about doing 4 little tank drive systems before. Was this a design you used for an actual robot you used in competition or is it just an idea?
The only thing I could see that looks like a problem would be the placement of the cims. Might the cims on the left be better on the inside too? When driving by something, they look like they might be hit.... I dont know. I have no experience in that area.
