Although I have never raced at NCM in real life, I've watched many hours of in-car race videos and this seems accurate. Please be encouraged to publish another layout that includes the additional "Sinkhole" carousels after Turn 17, which is the preferred ChampCar Endurance Series layout. It would be extremely helpful to sim practice this layout.
Aside from that there's some details missing like rubble strips don't make noise, run off areas are set appropriately (gravel trap or grass), missing the Armcos in areas, and the start-finish flag station looks like its made of 2x4s :D Otherwise, great work and I look forward to your continued efforts! Thank you!