I agree with aart. Lots more ventilation and windows, all covered in hardware cloth well secured. Buried wire or a concrete foundation to keep out digging predators. You could add 2"x4" woven wire over the chicken wire, but better yet get rid of that useless chicken wire and add hardware cloth. In addition to a 4" board to keep in nest materials, add a roost bar about 8" in front of the nests, so the hens can hop up and see who's in the box before climbing in. I use tree limbs, 3" to 4' diameter, as roosts. Enjoy your birds! Mary