We put ours together during that window when the rules had been changed to disallow any additional material to hold the noodles in place. To compress the noodles as much as possible so they expand to tighten up the fabric, we used another piece of wood and tie down straps. It made a sandwich of wood-fabric-noodle-wood, all held in place with the straps. It worked very well, and the bumpers held up all through regionals. You can see some photos of the process on our Facebook page:
https://www.facebook.com/media/set/?...22145& type=3
Some of the other albums there show the final product once we added the black liner and aluminum edging. They attached to the bot via T gussets on the bumpers and screw posts on the frame corners. To swap, it was just a matter of taking off some wing nuts.