Thats not a bad layout at all, it needs a few tweeks. The first ramp typically involves a barrier accident, the pits btw you can see where they are if you go into single player rather than multiplayer - theres a row of 16 spaces at the far end and they are the pits on that track, this needs consideration as to where you put the first split (I didnt check) so that drivers cannot jump the start by pitting.
Experience has taught me to use tyres sparingly. Its ok to allow the rejoin sections as you have but as soon as somebody hits those then those with a low end computer will run into serious framerate issues, so try to cull the number of tyres.
I've not checked the spacing on the ramps - they're a pig to do, do they cause unpredictable flips?
Overall a good track with some interesting features.