I was actually drawing up a robot the other day with 16 rover wheels, but the weight of ~125 in. of chain on ONLY one side to drive 8 of them kinda put a damper on my plans.
I'll be interested if your concept is the same as mine (but probably not, since my ideas tend to be a bit far fetched (albeit perfectly legal by the rules).
Oh wells.
Edit: Oh, omni... Definitely not the same concept. HA! There's a shock. lol