I agree in making the droppings board wider...it's amazing how wide spread they leave the droppings. And I assume the roost is a 2x4 w/the 4"side flat. I'm from northern Ohio, know what kind of weather you can have. The larger roost makes it easier for the birds to tuck their feet under their nice warm feathers. It also makes it easier for them to roost w/o having to grasp a small board all night long. My nest box is inside the coop...no problem collecting eggs, lets me check out the coop at the same time. It's elevated off the floor almost 2 feet...plenty of room for the chickens to use the floor space. You might want to make the top of your chick area slanted...otherwise you'll have chickens on top using it for a roost and making a mess of the top. (where ever they sit, they poop!) Think carefully about the number of chickens you want vs the space you have. I have 15 chickens for 8x8 coop...thinking I probably have more girls than I should for the winter. I've heard they don't like to go outside that much in the snow, so most of the day (and night) will be spent inside. While technically I meet the min requirement (4 sq ft/chicken = need 60 sq ft and have 64 sq ft), when they are all milling about inside, it doesn't seem that roomy! It's amazing how fast they grow...when they were young it seemed like we had room to spare:/ Good luck, keep tweaking the plans, and you'll have a wonderful time next year with your chickens
