4 Play Racing runs an Ebay store where they sell the (unassembled) parts and instructions for 80/20-based sim racing rigs. Like this one here for $449 shipped in the USA (also pictured below). My question: How much would this cost for me to purchase the materials myself? If it's a massive savings to purchase the materials myself, I'll go that route, but the convenience of the Ebay option is compelling. Thank you to the community for your help and advice.