Another pine shavings person here... we use it in our chicken tractor. Only reason it's not used in the fenced area is because they're on the lawn and moved around weekly.
And the poop trays we use andycowboy are just serving trays that we picked up locally that happened to fit in the roost area. But it depends on your roost area if that would work for you also.
Serving trays? Like regular school/cafeteria food trays? You have a picture of how you did that? Sure sounds easier than building a tray!