As a local I can only say this is fantastic! Even the Bins seem to be in the correct places around the banks!
I think my only criticisms are that the AI stays far too far to the right exiting the Esses - the normal line should see them reaching at least the middle of the track in order to lessen the tightness of the turn through Old Paddock.
Also - the pit exit should have the grip co-efficient of an oil slick, and have a moderate bump (drop) just as you're passing through the tire barriers. Trackdays regularly feature cars spinning there while entering the track, and I've even seen plenty of race drivers do the same on race weekends!
Tower corner is decidedly off-camber in real life - even after the resurfacing - The corner 'feels' right in terms of car behavior, but i can't really tell in the Rift whether you've modeled the camber or not?
I note the kart track has been accurately modeled too - can we expect that in an update too? :D