82 degree intersecting ends throughout. Diameter is 6.75 times the piece length. Join three pieces with 5x16 plywood gussets to make struts with 82x30 compound angle at one end and 82x18 at the other end, each facing up. All identical. Assemble all the three strut triangles first and attach five triads to each other to form the top. A central post helps to lift as you build upward. Five of the triads are truncated two thirds at bottom.
Simple assembly. Thank you for your interest, Ashok.
Affordable if recycling and repurposing.