Aart: Thank you for posting the "how I did it" link. My contractor has been building our coop and is making the poop drawer and perches today. I thought the poop drawer would need to be a lot deeper, but if you only put in an inch of PDZ, 5" is too deep a drawer, and wastes roosting space. And as a new chicken mama, I didn't realize that they will dust bathe everywhere, so less PDZ is definitely better (and cost effective).
Planning for deep liter method in the coop. We have very sandy soil (our house is build on Torrey Sandstone) but it's fine sand, and the run was starting to smell so I scattered PDZ in there and added a few bags of construction grade sand last week.