While the people/company that built that are obviously good at building things, they clearly do not understand ideal chicken housing. If they did, the vents would be at the highest points, the two walls that are NOT vented. And the windows would have the openings on the top rather than the bottom. And the roost bars would be wide side up. Just because it's professional and possibly expensive doesn't mean it's actually made to suit the purpose well.
You've gotten good suggestions, I don't have anything really to add there.