Good for you for starting your planning early. There's a lot to learn about building a coop. Starting your planning/building way early will make for a better coop, which will make for a much better experience once you get your birds.... We'll get sexed chick from Meyer Hatchery in February. The time to plan is now! ...
AbsoLUTEly!! Was the best part of my designing, I just wish I had made the growout space a bit larger.See, my thought about 8 is that you're going to have a ton of eggs for a couple years and then they start molting longer and maybe having health problems and then you have a lot of mouths to feed that aren't returning much of anything. So, I'd say if these will be pets rather than stewing hens when they slow down, get 4 or 5 to start and set up a coop that makes integrating easier. Then you can add a few fresh pullets every three years or so.
Just noticed you're in MI, kudos on adding your location!
Make sure you plan for snow...it's removal to access coop/run and the load of it on your run roof and the keeping it out of the run or shoveling some out of the way.