We have a sumo ring at the hackspace so lets build some robots, thinking human controlled for simplicity.
See video for the basic idea, our are not likely to be that fast :)
If you need help with components design or anything else ask and some one will likely give you a hand.
This could be a good starting point for people
We got a bit distracted with piwars but are planning to build some so if your interested come along and join in :)