Here's another track I made, it's pretty short, but I used advice from my previous thread to make this.

It's actually really wide. I'll try to get some pics soon.

Nice job. But I don't see a definitive version while using this track. It's a very cool base for sure, but you should replace some of these annoying concrete barriers by some tyres or bales, especially on the inside of the corners. I tried the layout during 4 or 5 minutes, and I was kicked on the airs already 2 times.