This is a neat idea, although I see it as more of a nesting box or run enhancement than a coop. An explanation on how they were built (and maybe a look inside) and how the biddies use them would be helpful.
Still, it's terribly cute and has started dangerous ideas in my head. I currently have no real nest boxes, mainly because my birds are happy with a big straw-pile in the corner of the coop. After eyeballing these neat little playhouses, I see renovations in my future!