It took me a while and my friend Google came up empty-handed, but my other friend Amazonia now wants to sell me »Wühlmausdraht«, »Schweissgittermatten«, »Volierendraht« and »Kaninchendraht«… But that stuff is even more expensive in Germany than here!

And yes, Ducks love to sleep outside, i assume Muscovies are the same, and you will need to develop a routine to make them go into their house every evening.
Here this usually starts after sunset, when Blanca Duck approaches the porch, stating that she is "sooo hungry" and "didn't find a single bit to eat the
whole day.« After a while Pompom Duck joins her, then Earthquack, Pinball, Smaug and Pommes too quack the hunger-song. In the end 17 quacking ducks and eight rasping drakes make a deafening noise, so i grab the flower box (Balkonkasten) and prepare their supper-bowl with cold water, sunflower seeds, dry cat food, cracked corn, whatever greens i have at hand and whatever kitchen scraps we have.
I carefully step in between the piranha ducks, lower the bowl so they can test their dinner and then say »Alle Enten gehen jetzt schlafen!« and start walking towards the duck house. All ducks then start running into the house to secure a good spot at the dinner - bowl and usually when i step out of the house all ducks are inside and i only have to close the door.
Ducks can be trained to do obey simple commands, but careful: They can also train their humons to obey simple quacks…