DIY.. thanks for getting my blood flowing... I think I'm going to rivet a piece of webbing on the bottom on each side that will create a channel for the webbing to flow through. I think this should work great and solve my problem.Red. Just get some upholstery tacks and if you distribute them across the plywood it'll hold everything in place just fine. Might staggar the placement. When i had a tree seat with accesory cord I just used staples like you would for electrical wiring to keep eveything in place. But I imagine with webbing the upholstery tacks should work without damaging the webbing.