Lovely story and like you I love my girls. They are part of the family now and are treated that way. And by the way one of my girls are called "Fluffy But" 😉
The coop has a wooden floor with 2 layers of lino on top which is what they poo on. Every morning it's swept out and washed and put back when it's dry. It keeps lovely and clean as they don't go in there any more after they have finished laying. I even put sprigs of lavender in there to make it...