I purchased a used greenhouse on craigslist. It was the right width and the price was excellent. However no instructions and lots of labor. The lean-to is my design to get the fish undercover. I have worked with fish in the garden pond industry so I had lots of leftover stuff to retrofit. Old trampolines can be redesigned into small greenhouse about 12 x 14. Usually you can find them for free. I have one I turned into an arbor. Think arches not circle.