Well, I can't claim design or construction of the coop...I'm a cheater! We did design and build the outdoor run attached, though! A portion running behind the coop only has a wire top, since the tree and coop provide shade. The rest of the run gets plenty of sun, even with the top. We wanted something for all weather use and more predator-resistant. My next improvement will be recessing bricks along the outer edges of the run to discourage digging, though we haven't had any issues yet.