I don't normally give a rating this high to a coop without plans, or at least detailed dimensions. But I found the idea of the coop evolution interesting and the design with the built in brooder and integration facility plus the way the coop fits into your overall property -- even including the feral cats -- was so well-considered that I had to add a star.
I personally would find it helpful if you included a set of "From this, to this, to this" photos to help people envision how their current coop might grow to meet changing needs.