I have an old rabbit hutch that I have converted to a bantam coop. I made the coop 2 floors, so that the bantams had access to grass/dirt via a ladder. Unfortunately, some malicious critter dug underneath the coop and took the previous occupants away. How do I make the coop safer from critters? Not sure if I should add chicken wire to the floor of the coop? Also, the top floor currently has chicken wire, but this set up doesn't not work well with clean-up as there is no pull out tray and straw falls to the bottom floor. Since adding a tray is not an option, should I install plywood or vinyl squares? Any ideas would be much appreciated.