One thing about ducks is that most do not like ramps - if they use it, it will need to be wider to accommodate the waddle.
Muscovies are pretty big - especially the drakes.
My muscovies can climb a ramp, but those prefab ramps need widened. Plus, my muscovy ducks don't want to go to bed at...
I had the prefab in the first post. It was ok, but we sealed it with water sealant, added a few things to make it more sturdy, and didn't let it sit on the ground but it was ok for 4 fs chickens. But, I wanted more room and easier cleaning - so we built one out of scraps.
But, for ducks I don't...