I made a grid-based workstation for sheet goods out of 2x4s clamped on a rolling cart. It’s the perfect height for unloading panels from my truck and cutting them to size. The cart is made from four 4' boards interlocked with two 8' boards. Notches are cut in each 2x4 that fit the thickness of their mating piece, loosely holding the boards together and making them easy to replace. These cutouts, which I made by boring out most of the waste at the drill press and chiseling them into a semi-circle, allow clamps to hold the 2x4s to the cart.