My 15 "Buff" girls are soon going to be needing nest boxes. They will be 5 months old on August 15th so I'd like to go ahead and get a box or boxes in place. I have never heard of a "community" nest box until I started doing a search for nest boxes. At first, my plans were to construct some wooden boxes with dividers in them. After reading what little info I could find on the "community" nest boxes, I have become very interested in maybe going that route. My birds are in a 20' wide x 30' long pen with wire that is 6' in height. I have a nice coop inside that they roost in each night. I'd like a box that I can attach to the backside of my coop. What I have in mind is a box that would have a sloped top that would be hinged so that you could open it up to access the inside of the box to put in nesting material and also to retrieve the eggs. I have no idea as to the size to build this box? It would be used by 15 hens. What height, length & width should the box be? What about the opening? Round hole or square? Hole dimensions? How high should the box be off the ground? Would it be okay to build it out of pressure treated lumber/plywood so that it would last? Hope to get some help from some of the many experts that I'm sure are members of this forum. Thanks in advance for any help you may offer!