I tried with all the walls I've got and it all looked really stupid. I even put windows down and then tried it out with the different landscapes and it just didn't look too right to me. Idk what to do with it, it's meant to be the sky but looks silly with anything else.
Anyway, I've finished it:
http://i.imgur.com/WWmNa.png
I'm hoping to host it as a 3 player race or something like that, I think it'd be more fun if you're racing with someone rather than anything else.
Switches are for anyone that falls, okay.