I use 1/2" baltic birch for backers and end up with a lot of scrap. Cut them up in strips and glued them face to face to make usable pieces to make this box. I only do something like this when my planer blades are super dull and I'm ready to change them because all the glue and end grain in the plywood will dull them quick. I used stain to even the wood color out a bit.