My new pens aren't really coops at all. I like to keep the tribes separated into small groups. Most tribes have about six birds with the biggest group having 9. I'll not build another closed in coop especially after this blistering hot summer. My runs wouldn't be secure enough for most locations but here the threat of predators is low.
Would please post some pictures of your run buildings?
I would like to see them and possibly use the idea for my chickens.