I don't have access to a CAD file right now, but i have a picture of the drivetrain:
I apologize for the massive size, but i couldnt figure out how to make it smaller (thread for original photo and topic:
http://www.chiefdelphi.com/media/photos/36226)
This year we made a laser cut Sheet Metal Drivetrain done by Rowe Trucking. Its thickness is 1/8'', and is extremely strong. However, we could cut the thickness down to help weight wise.
All in all, i liked the drivetrain, but i really like simbotic's "kitbot on steroids".
P.S. A box frame isnt half bad either.
Hope this helps,
Good Luck,
-Duke