Another idea for a fixed coop and run setup is deep litter... as soon as you can "smell" the poop, spread a layer of hay/lawn clippings/leaves over top. Keep doing that until it's too deep or the birds are done. The used litter can then be spread in the garden for spring or moved somewhere to further decompose into good garden compost. The one bed that I've been adding this mix to for the past few years did really well this year! (I started with really bad soil. A few years of chicken compost fixed it.)