Although a classic style I can say the dimensions for this was entirely my own. Everything was made from materials available at your local lumber yard and there is only really one angle though it will help if you have a compound miter saw. I started with a single 10 foot 2x4 for the legs and cut for legs at 1-1/2" square. I then did a compound 12.5 degree angle on either end. The top and end cut should be parallel to each other. The measurements for the three pieces on each side are 5", 13-1/4" and 21-1/4" and I used 1-1/4 inch think cedar deck planks cut to 2-1/2" wide. You can play with these lengths a bit if you want to move them up or down or make the piece wider. you just have to lay the two legs on the bench and measure the distances where you want them. They all repeat the 12.5 degree angle.
Assembly is done with predrilled screws in from the outside of each leg and I used #10 3-1/2 inch screws. Once the main obelisk is assembled, the vertical pieces are one inch square with the length cut to look good. I topped it off with a cedar fence cap and a wooden ball you that includes a lag screw in it. Finish is a solid stain and I installed some 12 inch screws in the legs to allow me to secure them in the garden with some bricks under the legs to keep them out of the dirt. These look great with a Clematis climbing from the inside.
