Bought this coop as our first coop - as soon we put our 6 weeks chicks in, we realized the coop was way too small. Added a wall, a platform to double the space. But the coop leaks after rain, covered with tarp, no ventilation, pretty awful! so we bought another coop soon after (all happened before we learned about BYC!) Lesson learned.
You can see our modification in the first photo, we never close the entrance, leave the two side windows open and covered with hardware screens when weather permits. But still pretty aweful in terms of ventilation when we have to close up.
After the second coop was added to the complex, only 1-3 chickens on average roost in the first coop nightly (mostly 2).
For the second coop, we replaced the entire big wall on the right side of the second coop with hardware screens when weather is warm enough (late spring/summer/fall) for ventilation.
Had we known better, the costs of the two coops would have been enough to purchase or build a much nicer, bigger coop.