I like portable chicken houses. My henhouses are mostly simple little 8×8-foot houses that I move with a tractor. I don’t put litter on the floor. The chickens don’t spend much time on the floor anyway: they use the roosts.
I don’t shovel manure, either. When the manure starts getting to be a bit much, I don’t remove the manure from the houses, I remove the houses from the manure. I hook up a house to my tractor with a handy chain and drag it to a fresh patch of ground. Then I come back and use the rear scraper blade on my tractor to spread the manure over a long swath of grass. The grass soaks up the manure greedily.