Some quick thoughts I have learned over the years. I am in PA so we have a similar climate to you.
1 Overbuild: get as much use out of the space you can
2 Easy Access: it's not enough to be able reach a space, and you must be able to get anywhere the birds may end up, but it needs to be simple
3 Hang Things: plan for where you will keep food an water and hang them up. You can then easily control their heights and keep the girls from scratching stuff into them.
4 Hardware cloth only: chicken wire neither keeps predators out nor chickens in.
5 Recess or Over Hang coop doors: did not do this on my coop. Regret it everytime it rains.
My girls spend a huge amount of time in the portion of the run that is under the coop. I am a big fan of that type of space as they seem to love it. So how do you get access to it easily? Removable coop floor. I can simply pull the floor up in the coop and take it out. Here is as picture of my coop. Both ends open completely. When I need to clean the coop I just grab a push broom and push it out the other side. Simple. I have also included a photo of the left side opened and Patsy sitting on her roost.
I am sure I know more than I put in here. I am happy to answer any questions you may have.
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