I'm surprised at the lack of reviews for this track - this is a good mod!
Some areas I'd pay attention to;
The trees - These need looking at as some of them look like cardboard cut-outs. Maybe a re-texture is needed, or failing that, simply rotate them a bit so that it isn't so obvious when you drive toward them.
The crowds - Any chance of replacing or removing the ugly 3D cyborgs that hang around the edges of the road? I don't know why people use these as they look worse than even the stock Kunos crowds - and they're bad enough!
The metal fence on the last bend - This can be driven through and you get caught behind the solid brick wall right next to it. Quite frustrating if you've had a good run and then get trapped a few metres from the finish line! Any chance of making this solid like the other fences around the track?
Other than these (minor) tweaks, I'd say this is one of the best hillclimb mods for AC and definitely deserves more attention.
Please carry on this great piece of work - 5 stars when it's finished, easily!