For the track made only by photo and video materials it's great.
I used to drive on Igora Drive by myself (old config) and it looks pretty accurate for non-laser scanned mod.
I can list some parts, where improvements can be done (all for national config):
1. Curbs (pretty all of them). In reality they are more narrow. For example: in T3 you can use asphalt by left wheels and concrete by right wheels on car like caterham. Curb will be right between wheels.
2. Inside Curb in T1 - it does not have relief. In reality it is pretty flat.
3. The end of left outside curb before T2 is usually used as an entry point. On the model it is ends like 5-10 meters before entry point.
4. There is a bump in the T6 in the model. In reality it is more smooth surface.
5. Bumps in T11.
6. The elevation change after T12 begins little bit too early in the model.
7. T13-14 a little bumpy.
8. Outside curb after T13-14 does not have relief. It is pretty flat.
9. Bug with hotlap spawn spot.
Can't say anything yet about new section, cause it is still under construction. But in the model there are also bumps.
Anyway, as i have already said - great work.
Thnx, man.
PS: You can use my onboard also as one more reference. Hope this will help.
https://www.youtube.com/watch?v=n1cDIxgscUo