Mavrk ........ I've had no problems with the nesting boxes on the ground ..... they girls love them! The other side of the coop is a lower roosting bar and pop door ..... the floor space is 4 x 8. I have the shavings about 8 inches deep. The girls love to scratch through it. LOL. I use...
Not sure if you can see from this picture ... but just under the roost I have a shelf with a one inch lip around it so that it can hold the PDZ. Under the shelf is my nesting boxes. I just use a kitty litter scoop to clean the poop every day. It take 5 minutes. The shavings stay clean.
Bigger is better! I bought a coop from the feed store that stated was the right size for 4 - 6 chickens ....... not so. As my 4 chickens matured we had to expand the size of the coop. The coop was originally 4 x 6 ...... now it is 6 x 8 and I wouldn't put more than 4 birds in there now...