I experemented with several ideas and wasted a lot of time building things that did not work. I finally came up with this. I built it from bits and pieces of things I have laying around. It is 5 pieces of 2x4 spliced together with 4 pieces of 1x2 on a stand. We are having very high wind today it keeps blowing this over so I had to stake it to the ground. It turned out 7" too short but no problem I can over lap the glass or add 7" later. The glass just leans up against the board and sets on the soil. The glass edges touch each other and over lap at one place. I planted Swiss chard, spinash, turnip greens and beets inside the glass. I also planted turnip greens, kale, swiss chard outside. It has been over 20 years since I have planted any winter crops it will be nice to have some greens this winter.