Hello, I'm afraid I know the answer to my dilemma but thought it was worth a shot here anyway.
My broodiest hen appears to be eggbound. She's older, at least 5 years and has never really been a consistent layer even in her youth. She's also been broody all her life with me having to get her...
Master Gardener here :)
If you have the proper proportions of brown to green waste, it shouldn't smell at all. Your compost pile should be layered w/dead leaves or other "brown" (not poop) in about a 6" layer, then the next layer would be green (lawn clippings, soft garden trimmings etc.)...
Maggots do not dine on live chickens. Chickens love them and they are an extra source of protein. I bet if you lifted the mat and the chickens saw the little buggers, they'd be devoured in no time.
This is not to be confused with an egg-bound chicken who has maggots around her rectum...