I'm not trying to reinvent the wheel here, but I'm looking for a cheap, portable, small jig to rip plywood. My table saw is a little under powered for this. Currently, I have to rip a small strip off of the plywood, then use the factory edge to cut the rest of my pieces. I could just keep the small strip for other sheets, but its a pain to store, and eventually it warps. I could make a jig that would be more substantial, but again, a pain to store. I just tried a cheapie 2 piece aluminum straight edge, but the joint was too flimsy, and my cut curved in where the joint flexed. I'm looking for a sturdy, collapsible jig to rip 8' plywood sheets. Any suggestions?