I have the 2006 70 Mile Brighton TDC route map in PDF format. They had to re-route the course a bit near Lee Rd and US-23 because of construction at that time but I could easily describe the route change to you. A nice ride overall and you get to ride up and down the nice hill hear the GM Proving Grounds in Milford.
PM with your email address and I will send it to you. It's 583k so it is too large to post to the message here.