Okay, let me see if I can explain what my question is with the help of a couple of pictures. The size of the coop, converted from a pigeon loft, is approximately 12' long by 10' wide. That is the main portion of the structure, with a smaller section that I am using for a brooder at the moment. You can the ledge where they can come and go from the smaller section and I plan on installing the nest boxes in that section. My thoughts are to run a 2 x 4 flat from one end of the larger section to the other, about 36" off the floor. I can secure it to the ends and to the landscaping timber you see in the picture, as well as supporting it by means of another landscaping timber post/brace from the floor. I would like to be able to keep 15 hens, mostly Black Australorps, but also some Buff Orpington, Barred Rock, and Rhode Island Reds. They should be able to use the ledge to access the roost and to leave it, without having to jump so far, up or down. Does all of that make sense and sound like it could work?