Good luck on the project!
Dimensions of the run is undersized for 6 chickens at only 50 sq/ft; the minimum requirements are 10sq/ft each bird, which to me is still very confined when stuck inside and they can't be free-ranged. Most people place the feeder/waterer inside the run, and this reduces even more space per chicken. I would expand the run for sure, like 2-3x the size if it was mine. Coop size looks fine to me.
In regard to the coop structure, I don't see much ventilation, and this is important. A window can work, but you can also add other vents, such as gable vents or in the eaves/soffits. Having airflow adjustability may also be a good idea depending on your region and weather patterns, such as hinged or sliding covers.
I think you have way too many nest boxes for only 6, you could probably get away with just one in reality. Make sure the roost bars are above the boxes, and that their poop won't fall into them or where they'll be walking into the boxes. I'd figure out the type of bedding management system you want to use now, as to me this is a big consideration when determining coop layout in terms the installed heights of everything in relation to the bedding on the floor. For example a chicken door and human door located at floor level, would not be a great idea with basically any bedding system over 1" deep, as there's nothing to keep it held back inside when door is opened or when the chickens go back/forth.