I'm thinking to have 4'x 2' of wire enclosed under roof on the east side, then the main 4x6 enclosed portion of the loft. I now think I want the people door as well as the trap and another door to the aviary portion, all on the east side. All perches and nest boxes above 18" off the floor to leave the bottom open for wire covered openings on the three remaining sides with hinged covers to close or open. Then in the ceiling there would be additional ventilation that could be closed if needed. The roof would be slightly elevated - in hope of preventing the sun from overheating the interior.
I expect the lower vents will let in natural light also. Do I need additional windows, or can they just go in the wire portion for sun?
I expect the lower vents will let in natural light also. Do I need additional windows, or can they just go in the wire portion for sun?

, and yes you are right about the winter temps in WI. Also its gets pretty hot and sticky in the summer, maybe not quite as much as where you are. In the summer, I wondered if at least the south exposure could be insulated to prevent excessive heat building up during the day - or will the ventilation take care of that? In my experience with chickens, ventilation is your friend - and heat, not cold is your enemy.

