About this 3D model

Designed to put two gear motors of this model back to back: http://www.pololu.com/catalog/product/1120 or the lower torque equivalent of the same housing. has 3 mounting holes on the top and bottom. has 2 mounting hole in the front, added after picture was taken. Includes a hole to line up with the tab on the motor. Designed to be a modular component of my sumobot.