Here's a coop I built from stuff people were throwing away. The screened doors are where the hens live. The solid panel on the right swings out to expose the nest boxes. I removed the rollers from some discarded kitchen cabinets and put them on the bottom of the nest boxes. They pull out smoothly, like a cabinet door. The upper level (behind the solid panel door) is for nest boxes. A large space under the boxes is for storage. That saves a lot of trips back and forth from the house.

We hit -22°F a couple of weeks ago. The birds do fluff up in those temps. I've posted this elsewhere but will add it here. +10°F and the girls aren't even fluffed up. The people door into the coop is open as is the metal PulletShut auto door. This old drafty barn isn't going to hold any heat.
