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It is awfully nice to have the capacity to divide both coop and run to accommodate however many separate groups you wanna have at a time. (Or have multiple permanently-separate runs, with the capacity to subdivide the coop interior, that works too).
You will be needing at least *some* degree of separation if you want to be growing out chicks, and even in the first year you will probably wanna have a separate pen for those 15 roos to finish growing out in (between maybe 8-10 wks when they start to get sexually-active and belligerent, and 16-20 wks when you eat them -- I know it doesn't seem like a long time but it does when it's *happening*, really really). Also depending on what your breeding goals are, you may want to have two or three separate breeding pens (so you can preserve more genetic diversity to reduce the problem of inbreeding).
So in general I would suggest building as big a coop as you can manage. If you are in a very very cold-winter area, squareish may be better but in any other circumstance "long and thin" may be advantageous, although if you want an interior aisle the bldg should probably be at least 10-12' wide (wider is better but more expensive to build).
My best piece of advice I think would be to PUT THE COOP ON HIGH GROUND. Not just so the coop doesn't flood, so the *runs* drain as well as possible too. Even if this is not as convenient or as aesthetically-pleasing a place.
Good luck, have fun,
Pat