This version of dynamite had to be built a couple of times before it worked properly. The problem is that the 4mm polycarbonate sides have to be cut very square or the robot frame is twisted and all four wheels don't touch the ground at once.

The first two pictures are top views. The metallic looking stuff between the wheels is aluminium foil sandwiched between selotape. I did this because I was getting a lot of interference. Later I discovered that this was because I had left the wires between the motor controller too long. When I shortened them the intereference problem virtually disappeared.

Dynamite is a very tough robot, but it had fairly high ground clearance, so I added some thin plastic film on the front and back to, hopefully, get under the other robots.