Before I say anything, awesome work! This was one of my favorite tracks in Forza, and now not only have you brought it to Assetto Corsa, but you've updated it and made it all our own with the added features and skins.
So on the subject of updating, my only issue with the original design of the track is that it's just too wide. It's almost like you're on a highway in the middle of the woods. I think if the track width were reduced by 30-40%, it would be much more realistic and less "arcadish" feeling, and you might even add an additional technical feature or two. I wouldn't touch anything else but the track and grass surface geometry. Narrow the track, widen the grass and runoff areas. Certainly keep the original, but this alternative, either "vintage" or "refresh" version could make this track even more special. I know it's not a quick thing to do, but it would be easier than making a whole new track. Think about it--could be cool.