OK, I am not an expert, just started about a year ago, but I do this full time. I have a lot of birds, ducks, chickens and a few geese. My ducks were easily trained to go in a shed at night. I use moveable electric poultry netting, and I placed it tight on either side of the ramp to the shed, then corralled birds up the ramp. Of course, the fence was cold while I did this. Then I placed it about the closed shed and turned on the power. My birds free range within about an acre surrounded by charged poultry netting all day, no Anatolian, no problems with predators. They do hang out under a pine tree a lot, I assume they are wary of raptors. We do have lots of predators here, but the netting works very well to protect. Used other netting to cover pens with ducklings to protect from raptors. The netting is from Premier 1, and they use it to protect beehives from bears. My German shepherds won't go anywhere near it. Premier says predators do not dig under it, because they quickly learn it hurts, and so avoid it. My adult Muscovy ducks are not confined at night at all, just protected by the netting. My adult Rouen also free ranged all night. They had been trained to go to the shed if I walked them that way, so when I wanted to contain them, I put them in the shed in the evening, and caught them indoors the next morning for processing. I do my own processing. Over the past year, I have raised and processed a few each of Cayuga, Pekin, Rouen, Khaki Campbell and Muscovy. I harvested my Pekin at 12 weeks, they were larger and plumper at that age. I use wax to remove feathers and down, works very well, giving a clean carcass even if you start with a black duck, such as a Cayuga.
You can also use food to entice ducks in, but they are creatures of habit. Once they got used to going into the shed at night, I could coral them in using outstretched arms, sometimes with poles, walking slowly. I trained the geese the same way to come into the fenced area at night, they ranged over a few acres grazing during the day, and returned at dusk for a snack. Now, because my geese are laying they are housed separately several hundred feet away with another length of electric poultry netting. The gander was too aggressive towards my other birds once his geese started to lay.
I currently have 60 8 week old meat birds in a yard attached to a shed. They will not be harvested until about 14 weeks of age. I have trained them to walk up the ramp in the evening. They know there is food and water inside. After they eat/drink some, I leave them without food//water overnight. The Pekin will be less flighty if you can hand raise them. The more comfortable they are with you as ducklings, the calmer they will be later on. I know that is easier said then done.
My methods have evolved over the past year, but in general, I train birds to go into the shed at night, then let them range in a pen during the day, and return to the shed at night. Finally, I let them free range during the day, and pen or place in a shed at night. Adult ducks can sleep outdoors through the winter as long as they have shelter with a hay floor for bad weather. Same for geese. Muscovy are more sensitive to cold, and should be sheltered winter nights. My chickens go to their coop at night to roost and I wander out later to shut the door. Once again, I rely a lot on my poultry netting, and so far, so good. I do rely on my GSDs to alert me to predators at night, but they cannot be trusted to stay with the birds, except the geese. They keep their distance, but now the geese are nesting, and the dogs will steal goose eggs if given half a chance.
Regarding your schedule, Rouen are not aggressive, so once you train to go into a shed, in my experience they can range with any chickens or ducks. I guess I would just be concerned about them all getting too crowded.