Here’s a series of five pics of the woodshed I built from reclaimed materials in August. When we moved into our new office, the contractors left a construction table. I used the table top (which I painted with grey deck paint) as the floor, the sides of the table as the ends, and the 12-inch cruciform supports for the triangular parts of the ends. A sheet of 7/16-inch OSB cut to size made the back, and corrugated polycarbonate made the roof. I used untreated 2x4s for the framing, and pressure-treated 2x4s for the floor frame. I hand-excavated a 4-foot by 8-foot level area and built a frame out of pressure-treated 4x6s, which I had filled with gravel.
ETA: Oh, I painted it with some ‘brick red’ paint we had left over from the house.