What a cute and clever idea! Clear around the planting area, for productive growth of the beans. Greate hideaway for kids in the yard, leave the grass in the center.c- I might do this even if i hate beans!
mini greenhouse, would start plants sooner in the spring and protect from frost. Would also be good to cover short plants to protect from hard rain. It would be even better if the windows either folded flat to the side or came off entirely.