[topgun]

What I remember from last year was that we assembled the KOP frame and we fitted the corners so the inside corners touched leaving a 1 inch gap looking like the OP's picture. We were told that the perimeter effectively had a diagonal in there and that it wasn't going to work. So we had a couple of kids spend three hours cutting and fitting pieces into each corner so we had a square corner.

This year the rules have been changed to allow up to 1 inch of bumper at a bumper end not having to be backed by the robot.

It will be interesting to see what the GDC rules. Hopefully it won't just be a blanket statement saying the GDC does not make robot design decisions.