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!
Elf house on a tree! That would be cute in the garden, especially in the tree over grown with ivy. How about some battery tea lights in the windows during outdoor parties. I hear the fairies/elves whispering "home school project" in my ear.