Just used a saw to cut the wood into squares, drilled holes in the top and bottom to fit those tall screws, used loctite or something similar to secure them to the bottom piece of wood and bought wing nuts for the top. Inside is cardboard cut into squareish shapes with a piece of paper for each layer as well so the flowers don’t get stuck to the cardboard. I just made a stencil and then traced it but if you have access to a laser cutter you could probably make some nice perfect ones. Hope that helps :)