I have a five by seven foot coop. I'm anxious not to reduce the floor space any more than I have to in order to install nesting boxes (my hens are six to eight weeks away from laying). The house is about five feet high and is constructed from tongue and groove planking on two by two studs set at about 14 inch centers. Given that the flock will be about 12 hens max I'm assuming that three nesting boxes will be sufficient. I'd like a nesting box which can opened from outside the coop and which is (obviously) waterproof. I'd have liked a nesting box with a wire floor and shavings but this might not be possible. Any ideas about how to construct this? Are there any plans online anywhere?