I saw this trash to treasure project posted in a DG thread. Just loved the idea I think I would add a screen on the back of the second shutter to to provide some containment of the soil. I guess they use two shutters to provide a deeper planting pocket. I l like the handle on the back idea to provide a tripod support.
http://www.birdsandblooms.com/...
Photo by bsavage (Brenda)