[JesseK]

1/32" polycarb could be riveted over the holes to prevent debris from cutting the belts. The obvious tradeoff is increased time to repair.

What I really like about this design is the ability to change the overall gear ratio VERY quickly. In the Quals, perhaps it would be better to be faster in one match since you're the dominant robot and a low gear at 7-8fps is fine. Yet perhaps in another match you will face a superior defensive robot, thus you would opt for a lower gearing option (5-6fps low gear) in order to push through defense. 2 pairs of large pullies with respective-sized belts would be a simple way to add that versatility.