Inspiration. Mansard style coop with run.
Actually, this would be a really fun project to build. What you could do this spring is take the existing privy, expand out the back by about six feet, staying true to the shape, use the back as your coop, the remaining part used for feed storage, separated by a screen door, and then attach the two side run areas with the coop in the back. It would look similar to the drawing.
When you finished you could sell your old coop on unclehenrys or Craigslist.
Some breeds I have are perfectly content in their space, the Faverolles for example. My leghorns, however, could never have enough space. They frequently maneuver to fly over the fence and visit the neighbors.