Here is ours. We through some nest boxes together with leftover scrap. We need to build some differently with more boxes available. Two hens get in the same one frequently to lay. Coop is fully insulated and stay warm in winter and fairly cool in summer. We use a box fan in one of the windows to ventilate during the day during the summer months.
https://www.backyardchickens.com/gallery/album/view/id/6163516
https://www.backyardchickens.com/gallery/album/view/id/6163516