Can't take pictures now, they've gone to bed and they get really mad at me when I wake them to flash lights in their faces
I have one droppings board that is just a plywood shelf under the roost it has linoleum on it, since it cleans easier than painted plywood. Every day I take a camper sized dust pan push all the droppings into a big metal dust pan, it only takes a second. I also have one that has wire between the roost and the droppings board, we used half inch wire, which worked great when they were young. I clean that one out from outside we have a door that opens to it.
In the newer coop I made a 2 by 4 frame and attached wire to the bottom and 2 by 3's to top for roosts but would attach 2 by 6's next time or something to get their tails up off the wire. I have 2 hinges attaching the frame to a 2 by 3 or 4 on the back wall, so I can lift it up, I stick a 9"scrap of 2 by 4 under it when I clean off the plywood underneath .
So there are many ways to make and use droppings boards, you just have to figure out what's best for you. If you use screws and don't like what you made you can always change it.
Sorry, forgot I'd taken some photos, they aren't very good and things were a little messy, but they should give you an idea of what they are. I can take the frame out by popping the pins out of the hinges, so I can hose down and scrub the frame and wire in the spring. The floor does stay a lot cleaner.
Cindy