The planned mesh should be small enough for baby chicks, but might not be large enough for adult poop. I may need to revisit that portion of the design as the latter is more important. I am willing to coddle babies for quite a while in an indoor enclosure. A temporary cover would also be entirely doable. Any suggestions as to the minimum mesh size for adult D'Uccle poop passage? Thanks for helping me trouble-hoot my design.
I was not aware of the roll-out system and have been pouring over the information. I may be using the term "external nesting box" inappropriately. I was planning to do something akin to Heather Bullard's nest box arrangement, http://heatherbullard.typepad.com/heather_bullard_collectio/2010/03/our-chicken-coop.html. There would be a hinged exterior door for access rather than a hinged roof. However, I intended to use stainless steel bowls that exactly fit the box dimensions (more accurately, the box was designed to fit the bowls). I can then just dump contents in the compost, wash the bowl, and replace the lining in seconds. The roll-out may be even more convenient. Thanks for the great new information and leads to research.
Nice design, very attractive! I have rollout boxes and really like them, they keep the eggs clean and prevent any egg eater issues. But definitely something to think about in the planning stage, once you've built boxes that are incorporated in the coop frame it would be a pain to modify them.