The Owl House is complete. I usued 3/4 inch plywood for all sides except the top, I ran out of scrap wood. I used a branch off the tree that fell in the back yard for the perch. The opening is 6 inches and the box is 24 inches tall and approximately 12 inches square. I ran out of time today to put it up in the tree so that will have to be done this weekend. I have several small holes in the bottom to drain any water that will get inside. I need to put some material in the bottom so any eggs that are laid will not roll around. I will post more pictures when the box is in the tree.