If you do that then you will be loved by all. I think the most economical would be building something like the Japanese do it, the small tracks that litter Japan. I will try to get some pictures of what im talking about.

120 mph is fast, that is going to need to be a long straight. Even a top speed of 100 would be so fun.

When this happens I will try down to Tampa from Jax to try it. You could go to at least 50 or 100 bucks if its all day.