Mine is something similiar to that?!
It's plastic. And a yard Shed. It has one window which my husband replaced with hardware cloth. And he also build a solid lockable wooden window Cover that is proped open during summer. The sunroof is plastic and solid. It gives the coop a lot of natural light.
It has 4 sets of double doors. I can open 3 sets during the day to keep it ventilated.
I only have a couple of hens, and so I partitioned the coop in half using zipties and chicken wire to the ceiling. I also used to old formica to make a half wall....so that the bedding wouldn't flow thru the chicken wire and out of the coop area.
I was able to prop a roost stick, wedged really, between two walls.
Being that it's all plastic, when I strip and clean the walls once a month, it's super easy to clean up.
At first I thought my husband was a fool when he suggested we use the plastic shed....now I think he's brilliant. lol.
If you'd like photos, I could get some.
Oh and the heat question......today it was SMOKING hot outside.....my hens stayed inside the coop, because it is so nicely ventilated with all the doors. It had to of been 20 degrees cooler in the coop. (which suprised me, I also thought heat was going to be an issue)