We have a very highly respected Avian vet near us. He gave a presentation on backyard chickens, and told us in no uncertain terms that this was a bad idea, and that causing hens to root around in their own waste would spread parasites. Yes, chickens scratch, but they're not meant to scratch in...
We have a feed hopper that holds 250lbs inside the coop. The water is either a 50gal. pasture waterer outside in the summer, or we use two heated waterers inside the coop in the winter. I *hate* having to water inside the coop. Such a mess! And wet shavings means a buildup of gasses that can...