[John Gutmann]

I read some posts in this thread then I suddenly thought of some simple ways to solve peoples problems:

do you need ice?
No, there is a product that is pretty much fake ice, it is some sort of plastic or polymer i think, and they use it for skating rinks,

Maneuverability.....
well for this i have a few ideas, first one is what allot of people on here talk about, HOVER-CRAFTS, and the other one is a walking robot with spikes. I don't know how good the walking robot will be if you need a smooth continuous Motion but it may be a start. You could just even do a custom wheel with spikes, you have no treads so it may even save weight!