You might be able to tell some from the following images, I didn't have my 'good' camera with me when I made this and was using my Kodak Zi6 video cam to make these.That is a GREAT idea! Do you have any pictures of this? I would love to see it, and the fiberglass roofing - trying to picture which kind that is....
first image shows the fiberglass roofing towards the top.
This shows the storage unit I salvaged into a nice area to hold supplies.
At the moment I do have hay for the youngsters to bed down on at night. But if not the fiberglass roofing sits on top of the storage unit that can be lifted off then taken outside to the hose to be cleaned then sit back on top again.. Works very nicely.
Hope this helps some. I just cut out a hole in the barn wall last night and added a window. I'll be moving the unit to below the window and then use 2 x 4's to make their permanent roosting spot. That way the girls can look outside at the final rays of sunlight for the day.
I still will need to install trim around the 2 x 4 window frame to give it the completed look. I'll then add a solid glass panel on hinges to be closed for wintertime.
I don't have a backyard 'coop' as such but my flock has the run in part of my barn. So, they have an area of roughly 30 x 60 sq. feet. They also can spend their days in the outside runs.