Micro Motor Robot Chassis and Brackets

I couldn't help but notice that Actobotics had really nice motors that were small with encoders but there were no open-source chassis available to download for cutting. I saw pololu had a chassis but I was going to find a more open-source solution that only used two motors and no more. I want it to be fast but yet maneuverable. Check the link below for the motor links.

https://www.servocity.com/html/micro_gearmotors_with_encoders.html

The chassis is meant to have two casters, two motor mounts, one chassis, and 6 brackets per robot for printed parts. The rest of the parts I am unsure about since it is work in progress. The robot is meant to use these wheals as well for the robot.

https://www.pololu.com/product/1090

I also used these thingiverse parts. Good luck!!! Thanks!!!

I used this ping sensor bracket.

http://www.thingiverse.com/thing:9107

I used this caster.

http://www.thingiverse.com/thing:1408935

Last but not least this motor bracket.

http://www.thin