@@user-kx2zh7el6e used a piece of sheet metal, actually a large metal shelf, the carbon fiber wrap I got off eBay for about 15 bucks, built several of them now for friends
They are very heavy and very durable but I think my set was built on a Friday, the welds look like crap on them for the price, I actually complained to them and they gave me a lift kit to make it right,