Alex Sawczuk
This probably wont get released for rfactor (1 anyway) but I'm sure the process will be of interest to a lot of modders. I'll be blogging regularly.
http://www.tltracks.com/2011/09/build-a-race-track-in-a-long-weekend/
http://www.tltracks.com/2011/09/build-a-race-track-in-a-long-weekend/