We have two muscovies and a pekin. We need a shelter for night time. It doesn't have to be fancy or anything, just something we can secure them in at night so predators don't get to them. They have a pond and they spend their days in the water or near it so we don't need a pen or anything like that. We have a lot of blocks and mortar left over from when we did our foundation so can we build a duck house out of cinder blocks? Any tips or pictures on how to go about it? I know we'd need a roof and a door from different material. Also, what would you put on the floor-concrete, dirt...? We're in Tennessee so it gets cold here, but not drastically freezing all winter if that makes a difference. I'd also like a decent sized shelter so we could add a few more ducks. I'm also not overly concerned with it lasting forever-we can make repairs if needed or build a new one in a few years. We're low on money for this type of project but we've got these blocks laying around so it would be great to use them but I don't want to mess with it if it's not going to be a good shelter...Thanks so much!