I'm wondering why a person couldn't construct a poop shute under their roosts? You know, a piece of galvanized tin roofing, slanted towards one wall with an appropriate sized door to the outside. Just open the door, insert a squeegee type apparatus and slide poo out the opening and into a conveniently placed garden cart or bucket/tub, shut door. Poop disposed of with a minimal effort!
When I was a teenager, I visited with one of my friends on her small dairy farm. When the cattle were in the stanchions, eating and being milked, she was pushing all the feces towards a long, narrow trough in the concrete floor. Then she just took the same "pusher" , for want of a better word, and just pushed the muck out of the barn towards a ledge that dropped the poo straight into a wagon! The pusher was just a rectangular metal end with a long wood handle. The rectangle fitted perfectly into the trough....like it was designed especially for this task..probably was!