I would make it at least 5 feet and 6 if you can. It will make it easier on you when you have to go in and clean or retrieve a sick/dead bird. We have built a shorter one (only 3 ft) and you either have to duck walk in or crawl. Neither of which is too fun. But we learned our lesson. We are in the process of building one that is 5 1/2 feet tall.
And definitely get some kind of covering on top. Even if it is a cheap tarp that YOU staple down.
And definitely get some kind of covering on top. Even if it is a cheap tarp that YOU staple down.