I have a welded aluminum rectangular frame that is 12' long x 42" high and 42" wide that was left over from a project. I planned on closing in the back 4' of the 12' for a coop and covering the remaining 8' with hardware cloth for a small run. I should have enough room in the coop for about 3 nesting boxes and a perch or two. My questions is... Is this enough room for 10-12 birds? They will probably be all Dominiques or Barred Rock. Thanks and what a great forum!!