Team 4926 Tank Drive CAD

Here is the link to the CAD Model and Renders: https://grabcad.com/library/frc-team-4926-tank-drive-6in-wheels-1

This is a tank drive chassis that is intended to be used in the 2017 season. It utilizes 8 6" pneumatic wheels driven by a single speed gearbox. The gear ratio will be determined depending on the game. This is also “West Coast Style” with the drive wheels being cantilevered. The gearboxes are setup to be taken off with minimal effort in the event of a failure, which is the main reason for the extra set of gears outside of it. Any and all feedback is welcome. Thanks for the help!

It looks like the flange for the bearing on the shaft with the driven gear and driving sprocket interferes with the casing of the TB Mini. Do you have a plan to fix this?