Iris Door

UPDATE: Finished the design, built it, AND it works! Finally, installed it on the shed... This is an iris diaphragm door that I intended to build as the door to my shed. My shed doesn't have a window and the door always blows closed when I'm in it - maddening. Anyway, this door won't blow closed. A sledgehammer to crack a nut, I know, but it would be cool. The design isn't completely finished, but it's near enough.