I can't tell by the pics if you have enough room...but if you can put chicken wire under it so they poop into a closed in area...and put a slide in box under it, with about four inches of wood shavings, it would collect the poop and once in a while, just skim it off of the top of the shavings. I have that in my main coop with an outside door for access and it makes clean out a breeze.
Kurt