I use deep litter method with NO manure board.
Behind the length of the roost is a rectangle shaped window. The girls actually look out it and benefit from the added ventilation.
Since the girls also jump around all over the roost, I imagined they would crash through any manure board I had in place. At this point it all works well for the girls with no
manure board getting into their way. As far as clean up is concerned, The girls crowd, and pile up on each other in the corner (even in the heat) to sleep. Their manure collects nicely in the corner, making it easy for me to clean up the area where manure collect most. I only have 6 chickens (but planning for a few more) but even then, cleaning under the roast is not a big deal. The coop floor is wood, but I tiled it with surplus tile-so odors are no problem, and cleaning is easy. The other thing, I was concerned about was scraping a cumbersome board and breathing in the dust- the entire idea seemed clumsy for my purposes. I hope this helps.