A single low speed exhaust fan that doesn't move to much air may help with humidity in the winter. Or if you could wire a rheostat/dimmer switch inline with the roof exhaust fan, you could slow it down so it keeps the humid air exchanged without it creating too much of a breeze in the chicken house.
Yes they have two other outside large runs attached with seperate fencing.
I can't cut at the top of main entrance wall, this is where the snow hits and sticks. People suggested along the floor.
however you can get a nice cross ventilation which does not put a draft on the roosting area.
I have venting along back side where you see round drill holes. Only way to try is to put low on opposite wall. Roosting bar is half way, but I have floor roosting ducks and silkies.
It is slanted, just not the greatest. Yes he did actually put the right roofing screws in. The only overhang I have is the sides of the coop, the overhang is so small on the front half of the coop I had to spray foam the gaps.
