Cutting the Compound Angles
The compound angles on the ends of the corner posts are the most challenging and critical part of this project. The plans show how the legs are cut on 10" angles in two planes. A compound mitre saw, tablesaw or radial arm saw are all ideal for the job.
Since machine angle gauges can be inaccurate, here's a tip for sneaking up to the perfect angles bit by bit. Start by trimming the bottom ends of each corner post to what you think is the correct angle, leaving the overall length of the posts 1/2" longer than needed. Position the bottom ends of the posts on the assembled bottom frame and note the accuracy of the cuts. Finishing nails driven partially up through the bottom frame will stop the corner posts from sliding out. Recut as needed until all four posts sit flat. Now, use a carpenter's level to draw a continuous line around the top of the corner post group. These marks show the length and angle to which the top ends need to be trimmed. They also make it easier to orient the top cuts properly in relation the bottom ones. The two trimmed ends of each corner post must be parallel.
Building plans and materials
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This is my pet peeve: My dictionary's definition of obelisk is: 1 a stone pillar, typically having a square or rectangular cross section and a pyramidal top, set up as a monument or landmark. obelisk 1 • a mountain, tree, or other natural object of similar shape. This is a trellis that's shaped like an obelisk.