I will post this in the proper section too, but I thought I would post here to give everyone an idea what the track on the Xmods site would look like and the size comparison to the cars.
The cost for materials for the basic track as in the plans should be around $20.
The only changes I made was to increase the pipe size to 3/4" and add couplings in the 10' sections to make every straight piece 5'. That way I can change the configuration, transport, and store the pieces away easier. I also added the cross piece (bridge) to signify the start/finish line.
I plan on adding more bridges to the straight pieces sticking out to make it more secure for when a car runs into them, they will not move. I also bought a bunch of extra material and plan on making it bigger, and create some new tracks.
Here is a link to the plans. You need Acrobat Reader to view them.
http://www.xmodsrc.com/tracks/track_03.pdf