Wanting to make a rack to mount Rotopax on. I want to mount on the side of my bike. The problem I'm having is I live in a small town and finding something is not happening. I need a peice of material 12x12 that I can cut and shape easy. what material would work. Star board, steel, alum. of good quality is to expensive., I'm down to stealing a stop sign, but I don't know if they would hold up, any ideas? Something easy to get but will hold up off road riding, so i don't think anything that flexs would work. Anybody ever tried a plastic cutting board? Sounds weird but I've see some pretty tough ones.