Oh I see about the roof to clean it. Makes sense now! They say you should have 4sq ft of space per chicken. I believe the 7ft length includes the nesting boxes so take length off, determine your new sq ft and divide by four. I think you are at maximum now. When they advertise their coops they only tell you how many it will "fit" not how many you should keep for a harmonious and low stress environment.
I know the feeling I got hooked and wanted more and now have two coops!