I sketched out the design on paper, even before going to buy the materials needed. I then cut all pieces to make sure the layout would work correctly. Nailed and glued whole project together. Then I painted the entire project and installed the mirrors. I wanted to have a small window sill to put small objects on so I made it stick out about 3″ to give it more depth. I then mounted it on the wall to the same height as the other windows in the same room.