just passing along information i have read elsewhere:
for the roosting area --- they don't roost on their feet --- they sit back on their keel bone (breast bone?)
as i understand 2x4's work great
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nesting --- after looking at your photo's --- looks like you can put a sheet of playwood across the top of the nest boxes to the cage to the right of it (chicken jail?) ... that would give the appearance of protection ... next would be to cover the front face of it
.... not sure how to accomplish this ... maybe put it on a hinge so you can open it up when you need to get in