I've seen lots of things mentioned here that I have incorporated in my own coop (stand up room for humans, vinyl on floor, outside egg gathering doors to retrieve eggs without going inside, storage inside, roosts and nests, walls insulated and with painted plywood covering for durability and...
My roosters 'favorite' hen has been injured a couple of times by the rooster grabbing onto her comb while... This seems to be an ongoing problem and obviously, it's not good for her health. I've thought about making or finding some kind of hood for her but don't imagine it would stay on long...