Installation technique depends on the type of window.
Here's some tips about heights for roosts nests doors etc:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-stuff-works-well.73427/
It's not so easy to just get them back into a run once they are out ranging.
There are tips...
Extending the rafters for good soffit ventilation would be great, but would likely require reshingling the entire roof, which might be a good idea but certainly not cheap and easy with scrap materials.
The large jalousy window is nice for rain protection, but inside needs to be covered with...
No. You don't want them to sleep in nest boxes.
Roosts should be higher than nests.
Here's some tips about heights:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-stuff-works-well.73427/
This^^^^!!!
Beware the typical staple gun(ie: Arrow 50)
Staples are too short....they...