The nest boxes were on the same wall as the human door. I only had two placed one above the other. There is enough space in the corner near the human door for more.
I found a photo of the roost area:
You know what, my old coop design would be just about perfect for you. Here are some photos of my old coop in progress (don't use OSB like we did - it doesn't last!). It is 6x8 and has a long overhang on the back. The windows helped with summer ventilation and letting in natural light. It...
Okay, so I'm making a quick drawing and it actually looks very close to my old coop. If you were to add a run which side would it come off of? I can't see how much space you have next to the slab.
On free ranging with an automatic door: With free ranging you WILL have predator attacks and more predators are out during the early morning. If I were to free range (I can't recommend it), I would build a run for the chickens to get fresh air in the early mornings then let them out to free...