The raccoon and other predator proof door on the main (chicken) house.
We had a few hens taken by raccoons early in the season. They were taken outside but when you tighten up security the raccoons tend to get more aggressive so I built a stronger summer door from the main house.
Yes, that would work. The camera makes it look like it's harder to see in than it is. I was mostly worried about airflow and keeping raccoons out to I didn't pay much attention to visibility.