Well after about 2 hours of sitting here going through different plans I decided to Ca the stringers to make them a little less soft. Then Im going to epoxy a sheet of balsa ply across them. I will then add a couple strips of 1/4 in hardwood squares on top to make sure it stays in place. I slotted the ply so I can run velcro around the batt and will run a zip tie in the other direction. I have only a small space to work with and this seems to be the easiest set-up for me. We'll see how it goes.