Sprinter Van Heavy Duty Bed Install

I built a bed platform using steel rails and steel tube cross members. Supplies that I used: Bed Rails purchased from Overland Sprinters - https://overlandsprinters.com/products/70-rails-only Black Speaker Box Carpet – https://amzn.to/2KKpdfv M8 x 16mm Socket Head Cap Screws – https://amzn.to/2ScHp5S 5/16″ Stainless Flat Washers – https://amzn.to/2YdlVJQ Hand Rivet Nut Setter Kit – https://amzn.to/3cUdxmu Loctite Heavy Duty Threadlocker, Blue – https://amzn.to/2yRGO2p 1″ Square Tubing 11 gauge 3/4″ Birch Plywood (2) sheets 4′ x 8′ Rust-Oleum Textured Black Spray Paint – https://amzn.to/2xW81RP Lucid 6 Inch Gel Foam Mattress – https://amzn.to/2Ybcqeg