That's sexy, I'd drive it.
FYI, I like how you guys down-vote actual feedback instead of ego-boosting. I was speaking from experience with sketchup & tracks made with it. Just to prove my point though I can tell from looking the racing "chalk" lines are modeled, there's unneeded verts/faces in probably 80% of the ramps/stadium.
Here is an example on one of Ethan's tracks.
All those lines you see really close together are not necessary.