Composite bird house...
I just found this on a shelf in the garage. I'd forgotten all about it until I moved something that was sitting in front of it. About three years ago I built a big composite deck for my neighbor. When it was finished, I had a bunch of "scrap" composite material lying around. I also had some pieces of 4x4 sleeve that covers the PT posts. I had to find a way to use it up. I came up with a birdhouse that should last a LONG time. I built it so that you can easily remove the roof or floor for easy clean out by just removing a couple screws.
Here's what it looks like.
"The bitterness of poor quality remains long after the sweetness of low price is forgotten"