Cap, when you mentioned the uneven floor in the coop, it reminded me of something. There is a town in Indiana that my brother was thinking about moving to. The entire area was built on a fairly steep hill/small mountain. You would think they would carve out level spots, but they didn't. The homes were on stilts to level them, no two legs being the same length. There was enough incline, it was obvious that most of them had to use four wheel drive to get up to their homes. Livestock was always on a fairly steep incline, looking like they'd roll down if they took one false step. The place he was considering, the realtor said, was one that didn't require a 4x4 to get up the driveway to the house. He, and I discussed that he was looking at the place under ideal conditions. I was not convinced that during rainy season, when the drive got muddy, or when it snowed, and the driveway iced over, that he could actually get up the driveway without a four wheel drive vehicle.
After we all left, we stopped at the local grocery store. My mother, his wife, and his kids all went into the store. He, and I remained in the car, parked in the front of the parking lot. In a bit, I commented that he'd have to buy two homes, one on one side, and another on the opposite side of the mountain, if he were going to live there. He asked me why. I pointed at a fellow, and said "watch him walk." It's like the man's legs were uneven, and he had this funny gait. I commented that he was about the 5th person I'd seen, walking funny, and we had been there less than 15 minutes. My brother commented that he too had noticed that there seemed to be a lot of people with issues like that. I told him it was because they got used to walking on that steep incline all the time on one side, and it affected the way their legs developed. He could live on one side of the mountain for a year, and when the kids looked like they were walking a bit lopsided, they could move to their home on the other side of the mountain, allowing the other leg to grow. Otherwise his kids were going to have lopsided legs. He thought about it a minute, started cracking up, and agreed with me.
A door for the coop is wonderful, unless the floor is too uneven, and your chickens have one leg slightly longer than the other, and walk funny on a flat surface. In that case, forget the door, and fix the floor.