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Hey, I grew up in St. Albans, and I could tell you stories about the raccoons battling my dad for years over the sweet corn he kept trying to grow in his garden every summer. One of the ones he trapped weighed at least 30 lbs. They're strong and vicious predators. Don't underestimate them. They grab chickens through the holes in the wire and pull them out, bit by bit. It's ghastly to come out in the morning and have to clean up what's left.
Two other things concern me about your coop design. Your flat roof means that snow is going to build up there, so you'll need to sweep it off regularly so it doesn't collapse. The other thing that concerns me is ventilation, very important in a climate as cold as Vermont. If humidity builds up inside your coop, your chickens are much more likely to get frostbite than if the air inside the coop was dry. Chickens' respiration adds a lot of moisture to the air, as well as any poop that builds up inside the coop. Your winter vents need to be up high at roof level so they don't let cold air blow in over the chickens as they roost, causing them to suffer wind chill.