I think a walk in coop would be too difficult to clean. Most of the walk in coops I see have the floor at ground level or just a little above. To clean them out you need a shovel and you have to lift the old bedding up to get it into a wheelbarrow. With mine I just open the back door, roll the wheelbarrow under the door, and use a rake to get the bedding into the wheelbarrow. Takes less than 5 minutes and little effort on my part.
As to the wind and snow, I do not tend to my birds during the winter. I set my coop up so that their food and water last over a week. I pay the neighbor to come here once a week to do the food and water. I do not worry about eggs as the older girls generally stop laying during the winter. The few that get laid freeze and are removed by my neighbor. Not an ideal system but it works for me.
I am 69 years old and have COPD. I can not breathe in the cold very well. I also have problems plowing my way through 2 feet of snow to get to the coop. Shoveling a path is more than I can do. I am afraid if I would fall in the snow, I might not be able to get up again. The system I have come up with works well for me. It would probably not work very well for many others.
In case my neighbor leaves there is another way I have thought of to tend the hens during the winter. Coop is only 4 feet from the house. I could possibly use a window near the coop to set up some sort of slide system. I could be in the house and use a slanted PVC pipe to slide food into the coop and also have another pipe for water.
Some day I will have to give up the chickens. For now I get to enjoy them during the months when we do not have tons of snow. When I am tense I only have to go sit outside with the birds for a bit. I come back into the house feeling relaxed and calm. I keep the birds more for the calm than for the eggs. My friends get most of the eggs now.
