2007 Fleetwood E3 Recently removed all wood rot from inside rear roof panel. Only thing visible now is Styrofoam. I need to attach the canvas track which is now flopping. I have no idea how its even staying up. Can I put a piece of thin plywood on the rear panel and then screw the track to that? It had rivits before. I'm trying to avoid a full roof rebuild until it cools down. We have no leaks now and only the back half was damaged.