I have spent the past few days building my first coop. It's 6 x 4 1/2 and about 4 1/2 ft tall at the back. If the three roosts I have planned, redlines in the pic, are about 4 feet long each, how many birds can I comfortable fit in there? I have 24 chicks arriving around April 11, but will cull down to just what I have room for. I also have a large pen area planned on the side of the coop, so they will only be in the coop at night.