Crawler Drivetrain

Here is a closer shot of The Crawler's drive train.  I'm already looking at a motor with more power, LOL!  The trouble with toy motor is they are toy motors.  I need to move toward industrial grade, but that is usually a trade off with weight (bigger motor), and power (bigger battery), so I need to find the right one (Balance).  I'm going to move the power switch, install a potentiometer, and mount the PIC18F1788 Microcontroller board today.  Might even get it wired...