Here are some CAD designs brought to you by Team 174.
Pneumatic Transmission Design:
http://www.offseasonrobotics.com/wp-content/uploads/2013/12/Pneumatic-Transmisson-Pack-And-Go.zip
Steering Assembly Design:
http://www.offseasonrobotics.com/wp-content/uploads/2013/12/Steering-Pack-And-Go.zip
Wheel Design:
http://www.offseasonrobotics.com/wp-content/uploads/2013/12/Wheel-Pack-And-Go.zip
Note that all downloads are meant for Inventor.