I'm thinking about building a nesting box...Any suggestions? Also, can you post pictures of yours? I would need mine to be kinda like a little house with a flour, sides, and a roof, as well as a little gate that I can close at night so that predators can't get into it. I would also like it to be inexpensive, as I'm not sure if my duck would even want to set in it, and I don't want to waste a lot of money. Thank you!