Today I decided that the nest box in my small coop had to be attached to the outside of the coop to make more room in the coop. So I cut a hole in the side of the coop and inserted the box. The box started out to be 12"x12"x12" in size, but after adding insulation and a lip on the front, the size of the box is down to 10 1/2"x 10 1/2 x 10 1/2". I have 4 Black Australorp pullets, not ready to lay yet. Is this too small for them to use? Does anyone else out there have small nest boxes and the hens are using them?