I have a 14ft starcraft with three bench seats in it. I have mounted quick release brackets to the front and back benches and intalled seats. I mounted the brackets simply by screwing directly to the benches. The benches are thin aluminum filled with foam. I'm roughly 200lbs and the alum seems to flex quite a bit when leaning back or rotating.Any tips or suggestions on making a good secure modification.My thought was to take a good marine grade plywood (maybe 3/4") and run that the length of the bench, screw that to the bench (any better way) and then screw quick release to the plywood.Thoughts?