Found your thread in the BYC search feature, and wondering how your Open-Air Poultry house-building project went.
Years ago, before Belfast became the broiler capital of the world and 40,000-bird contract chicken barns popped up like toadstools all over Knox and Waldo counties, there were quite a few of these open-air poultry houses around--some still are, though most have rotted into the ground (being mostly built between 1908 and the late 1930s, when open-air was the fad both in chicken health and people health), and quite a few have been repurposed as auxiliary sheds and playhouses.
I could never quite figure out what they were for, with those open fronts (the screening mostly having rusted away), until I read Prince Woods' book. Now it all makes sense.
Thinking of building one myself--the small 6x10 version--and wonder how you made out with yours.