Is most of the surface Tarmac?
Looks pretty good, couple of things I'd bear in mind in my view:
1. If jumps are sharp enough for a car to land upside down at speed, put the loose surface there too, a fat upside down crash into Tarmac sounds unhealthy for car and track!
2. Assume the rostrum is at the bottom?
3. With a long straight run up make the wall of death quite high, cos someone will ramp it flat anyway
4. Very small point, personally I wouldn't narrow up the mountain on the inside like that!
Like it though, would happily race that (tho I have no free weekends and live a few hours away!)