@3KillerBs has a thread about renovating the monitor coop design, took a good idea and made some real improvements in usefulness and expected durability. Hope its what you are looking for.
You are desperately shy ventilation. I'd have all the soffits open as venting, protected by hardware cloth. The Plexi window should be ventilation too. If you have windblown rain concerns, cover it with louvers, but definitely increase airflow in that.
Speaking from a place where 70s...