I totally agree. My coop is 8x12 with plenty of litter on the coop floor for a soft landing; they use all of that space to hop/fly off the roost. If the big door is open some will fly out the door.Instead of building what many consider a minimal sized coop for that number, especially in your climate where they might be stuck in there for extended periods of time, I suggest building bigger. A 6x12 would give them a lot more room to get down and make it easier for you to work in there. I don't know what style coop you plan, especially for the roof. Most standard building materials come in 4' and 8' dimensions so those are usually convenient to work with, but the cutoffs can often be used to build nests or such. You always want a roof to slope enough so water runs off instead of stands and in Massachusetts you want it strong enough to support snow and ice. A 6' width isn't bad for that, depending some on roof style. I also like overhangs which gives you an easy way to add ventilation up high without letting in rain and snow.
As long as the roosts are higher than anything you don't want them sleeping on you can make them any height you wish. As for the difference between the roosts and your droppings tray, you need enough room to be able to clean it. Since the droppings board/tray should stick out about a foot past the roosts they can use that as a step to get to the roosts.
I've seen baby chicks less than a week old and before they have wing feathers to fly jump up about a foot when the broody hen told them to. Many people would be surprised at how well older chickens can jump when they want to. Mine always spread their wings when they jump up or down and usually flap if it's very far so they need room for that. They fly up and they fly down, flying down breaks their fall. It's not like you jumping, you don't have wings.
You can build ramps, ladders, or steps. The edge of your dropping tray can be considered a step they can use if they want to. I did not provide anything specifically for mine to use to get to these 5' high roosts. I've seen an adult dual purpose rooster probably close to the size of your Brahma launch from this roost, fly forward about 7', turn 90 degrees to the left, fly out of the coop human door, and land in the run. My smaller hens do that regularly. They are not that helpless, but they do need room. I think making your coop at least 6' wide will pay big dividends for you in many ways.
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