Lofts for them to hang out equals more floor space. Throw a bale of straw up there and spread it out. My turkeys and peacocks love it. Right now I have a muscovy duck setting on a nest of eggs up there! Also put up rafters for them to roost on. Any roosts down low make sure you can tip them up out of the way when you clean. I like sawhorses for that reason and they support the heaviest birds without tipping over. So my birds fly from low roost up into loft... It is much warmer up there in Winter.
I prefer the metal nest boxes which can be attached to wall up off the floor. Hanging feeder and use 2x4,s and piece of plywood to make a platform to place waterer on.
My coops are kind of like my house in that I am always rearranging stuff! Think of the basic needs of the chickens. A place to roost, floor space to exercise, a feed source and clean water. For yourself think of the easiest way to arrange for cleaning and moving around to do your chores in there.
I have a large platform with cage on it for the occasional bird that needs separated.The cage has a wooden top on it so it doubles as roost area up there also. And underneath platform I place the waterer so it is out of the way and stays cleaner. So right there is 3 ways to use 1 space...
Instead of building pens in front for feed and extras we just put up dog kennel gated panels to access the chickens while leaving the front part open to use however we wanted. And you don't have to keep closing the main door behind you or letting the chickens run out every time..
So feed goes in barrels behind main door. And wooden shipping crate in another corner for a brooder.