The best designs I have seen involve a tripod base and telescoping "T" on top. It is easier to make a 4 legged base with crossed 2x4 s which will allow diagonal braces for additional stability. Usually there are 2 2x4 attached vertically to the base with a clamped or pinned slider to adjust height. The slider is capped with perpendicular 2x4 "T" top.
Hope this is helpful, and enjoy the work.

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