With the current version of the course creator (with no elevation control), it's impossible to create an accurate Road America.
However, this is the next best thing. While you might trace the track outline at Eifel flat, it won't give any of the feel of the real thing.
This, perhaps reaches about 30% of the original flavour of the track. Which is much, much greater than Eifel flat - which gives you 0%.
While T12 (Canada Corner), may not be 100% accurate, it certainly is in it's feel It's tricky to judge. Also, the scenery is well done: around the carousel there are trees and inner hill - just like the real thing.
Plus, this track adds it's own character, which is more than you say for any Eifel flat version.