First of all, as a local with Barber Motorsports Park in "my backyard," thank you so much for recreating it—the track map geometry is probably as close as possible to the real thing and it's very enjoyable!
I will say in terms of elevation, however, that the incline up the front straight is absolutely wrong—the actual front straight is flat with no incline whatsoever and merely dips off going into turn 1. There's also a significant hill/crest between turns 12 and 13 where vehicles get pretty light. The "Alabama Rollercoaster" between turns 3 and 4 should also have a much more significant dip and crest at 4 (it's the most significant elevation change in the whole track, and a LOT of fun), but I think that's likely beyond the constraints of the Course Maker. The incline coming out of turn 5 is almost eerily perfect, though! If there's any way at all to incorporate those corrections into the course, I would be ecstatic!