Nice coop. My neighbors have a chicken coop similar to that. Its not quite as artsy. It has a solid roof with a wooden frame with wire on the inside to prevent predators and fiberglass on the outside of the frame. They used the corrugated type of fiberglass. They have a section of double layer wire mesh at the top couple of inches with no fiberglass at the top on the walls allowing venting under the roof eves. The door is wire mesh. Works well for them. Its bright and airy and not to hot in summer but I have no idea how it would work for ducks...I keep looking at it and planing to make something like it one day. The only thing I didn't like about theirs was that it looks very hard to clean between the wire and the fiberglass. Perhaps a kind of hybrid coop between the one you posted and my neighbors with the fiberglass (not corrugated) and the wire mesh against it would be less hassle to clean out cobwebs, dust and whatnot I'm thinking.