Thanks!
I made that back around 2010 starting with an idea and then just ran with it. I wanted it to be functional, comfortable and look nice because it has to sit in the room all the time.
I usually don't build stuff like this so it was fun to create it. While I made a sketch and wrote down a few measurments, I don't have them anymore or any sort of plans.
I did document the process in pictures and you can see them at the link below. Those pictures go up to having the wheel for the xbox 360. As you can see by the pictures I've posted here I've added a new wheel, pedals, shifter and a few other things and documented that as well and when I find the time I plan on making a video of the complete build with a little driving to show how much fun I have.
http://www.bill-moore.com/sim/build/1.html