Used to have to be right by Brainerd in the winter and it ain't a nice place for racing then.
I'm almost positive there was a scratch built version made for rfactor and released as a very good beta. It would make a nice conversion to GTL and GTR2--nice flow to the track. There is also a GPL version with similar layout done by someone else. Lots of history with the track--early Trans Am, Can Am too if I remember right.