The sweet PDZ looks fantastic but I'm not sure how to work it into our coop design. Yard is small so coop will be in a corner where access to the inside will be limited. All the sweet PDZ pics I've seen have open shed-like coops. I don't think I'll be able to reach the far half of our coop design using a scoop. I'm going to show the link and pics to my husband and see what he comes up with.
You could always put a tray (cat littler tray, boot tray, throw away foil pan, lid from a tote) under the roosting bar and fill that with PDZ. That way it can slide out and should catch the majority of the poop.