I have been using my current robot as a platform for testing new ideas. I learned to program in PBP and have been working on new sensor ideas. I decided not to design a new chassis for it. The current one works well for testing.
I have been thinking about building a mini-sumo robot and ring. I think that I should by a kit and then build one from scratch. This would allow me to run test battles. Just an idea, I don't know if I will even build one.