I built a 4x8 run with a hen house in one end.
Things I did not think of, and would change:
The door and ramp are on the left side of the hen house, and the door I enter was built on the left side if the other end. Having them on the same side is awkward as the ramp is in the way of walking in.
I hung the food and water below the hen house. Nice and neat, no mess, and they have to go out to eat. However, I had to go through the coop, past the ramp and crouch underneath in the poo and dirt to get them for filling and cleaning.
I did solve these- made a ramp that went up the right and then angles across the front to their door.
Made another door on the opposite end that I can open to get at the food and water much easier.
For my clean out doors, I thought making it lip-less would make it easier to clean, and it does, but it also allows all the shavings to fall out as they move around, so I went back and installed boards across the openings along the floor so most of the shavings stay in!
I also would buy an extra water so that I can put the dirty one in the dishwasher when I want to switch them. I do this for my quail and it is so much easier than scrubbing.
Hope this helps!