This is all great advice. It is so importance to go through the checklist yourself, before build season is over. So, here's the official checklist:
1) Go through the Robot
Inspection checklist.
And, because there's been so much discussion about bumper length:
8) Bumpers. Use ¾ inch thick by 5 inches tall plywood, 8 inch minimum length.
The 8" does not include any plywood in the corner (overlapping another bumper). You must have 8"
from the vertex (corner of the frame perimeter).
I hope this helps. Good luck, everyone!