I have a raised coop with a huge walk in pen (which is getting a real half roof this summer) it has a dirt floor that I keep covered with at least 6" of straw for them to play in. It helps keep the mud down in the rain and gives them places to nest. I wish I had used smaller mesh wire and also...
looks like the only thing you missed was small mesh wire around your foundation and eave openings. Rats will find the grain if you dont block their access. Other than that this looks better than perfect!
I use straw. We have 3 or 4 bales of it at any time and the straw is about 3 - 12 inches thick all over the coop and pen. I'm in Washington and the rain here would have my hens in mud 3/4 of the year and the stink... yuk. With the straw it gives them a lot to scratch and dig in, nest in, hide...
I'm having a similar problem. I have been getting 5 eggs a day out of 7 older hens. My buff orpington got an egg stuck about 3 weeks ago. A quick trip to the vet and $100 later I figured I was going to lose her. With a fair amount of poking around she passed a tissue covered egg and has...