Chippy, I have almost the same set up as you. My "grid" comprises a couple of 4'x6"x2" held in the multi-stands and notched to take 3 off 8'x 4"x2". I drilled dog holes in the 6x2s to take a couple of 3/4" dowels, so that I can tilt the whole grid to an almost vertical position and load a full 8'x4' sheet of Ply/MFC/MDF or whatever and then swing it back to horizontal under control. I have found the Multi-stands to be very solid and dependable.