Few things. First, The coop is small because we are getting only two ladies from a friend, and I have to battle with the fun that is Colorado winters. With two ladies I'm at a smidge over 5.25 square feet per bird (not including the nesting boxes that aren't there yet). Second - please keep in mind that I am by no means a carpentry expert. I am flying by the seat of my pants with measuring and cutting here. I've never even built a birdhouse without a kit! So here are some pictures of where I'm at. I am filling all of the gaps cause by my poor measuring skills/cheap tools to avoid drafts. However, I don't want the girls to get sick due to poor ventilation. My big question tonight: What do you guys do for ventilation without compromising the warmth of the coop. I'd like to avoid using artificial heat as much as possible.