[@Shorticus] Yeah I'll probably mull over some ideas over the next few months and see how table top elements will work. Might have to do a bit of testing too to see how fair I can make it.

As for characters, that's something that I already thought about and as GM I would probably play a race announcer role where I commentate on the positioning, things that have happened and are coming up, as well as drop subtle hints ("we're dropping into the second straight, will player x open up on his nitro to take the lead from player y?" That kinda thing). As well as characters I'd design a track layout that people can see so it's clear as to what's coming up in the terms of cornering and obstacles. 

Most I would probably have is 4 players. Any more and itd be a shit storm.