What gears do you plan on using? eg. original serpent or modifying something else to fit.

To achieve the kinds of speed you are talking about with the Novak 4.5 I think you might run into some over heating issues if you plan on running continuously on the track.

Are you planning on using mechanical or motor braking?

1/8 onroad cars are a great build to do. You will turn a lot of heads when you are finished.

Keep the ideas flowing there are a heap of guys on this forum with a wealth of knowledge.

Cheers Andrew