Hey there.
Nice to see yet another MN person here. (I live in MInnetonka)
Sounds like a good track Idea so far. Can't wait to see some pictures. I would need something easy to store too, with my 2 bdrm apartment. Then me an my roommate could race! Sounds like you could be on to something. Post how Zips handle on that kind of surface when you get a chance.