Attach the Back Lentils
Now you're ready to tackle the back lentils. Lay out the plywood squares and mark where the 2 x 10s attach. Measure from the center column to each end and be sure to add 10" for the overhang. Make the miter cut needed for the alignment over the center column. Assemble the lentils upside down on the ground, repeating the previous steps for the front lentils. Set the lentils in place over the three rear columns, and be sure you have help. Once the lentils are in place, you can attach the plywood along the outside edges of the angled 2 x 10 (Image 1). As before, also add some screws in-between the lentils for extra support (Image 2).