Nice idea guys, I may well throw something together over the next wee while.

Just want to put an idea to you in terms of arena design/hazards.
It's been well discussed before that the development of the technology and armour etc can often lead to robot combat becoming a bit dull after the initial development phase. As this is a new class (in the UK at least) it will definetly be interesting in terms of diverse designs to begin with but once everyone's realised what armour is best and what motors can provide the most powerful drive-to-weight ratio etc, the ability to cause visual damage may be lost leading to it becoming less interesting to the viewer. Things such as the recent Active Weapons proposal discussion were intended to try and make a positive change in terms of combat and to make it more exciting to watch. It was clear from that thread that implementing such a rule in an already established weight class was not popular.

But what my suggestion is (and it's only a suggestion, feel free to disregard it) is to implement a creativity-inducing environment right from the outset to prevent the robots from developing into ground-scraping flippers and wedges. You could design your arena in such a way that it promotes ingenuity in design and different weapon types. For example, having several levels to your arena would encourage people to build their robots with greater ground clearance in order to go up ramps/steps. Making the floor of the arena rough and bumpy would discourage the superflat wedges and so on. You could still have your spinners and your flippers but it would perhaps give more of an advantage to the less-popular weapon types such as grab-and-lift bots or all-terrain digger-type designs. It could even be designed like model railways, in so much as the arena environment is a miniature representation of a real-life location (quarry, oil-rig etc - yes I'm just plundering ideas from Arenas of Destruction ). With your artistic ability Tom, I'm sure you could make it look fantastic.

But like I said, this is just an idea.
You could always just go for a flat floor