A down side of the heavy removable boards is that it is a pain to scoop. And work in the winter means they are already roosting when I get home. In the summer scooping can be done at dinner time. Coop 2.0 will have to address the faults.
I clean daily...and only use about an 1/8" of PDZ.
Yes, it will all freeze...around 25°F is when I find I can't get it off the vinyl liner with my hoe scraper, just have to wait. The wetter the poops, the more it freeze-sticks.