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I just finished building my own. Got a 1300 length of 165mm steel tube (5mm wall thickness) and two pieces of 6mm steel plate for the top (200 square) and a 300 square 6mm plate for the bottom. Materials cut to size cost $165 from the local steel merchant. Got a mate to help weld the top & bottom plates on, drilled the holes myself, and spent another $40 on paint, threaded rod, nuts etc. Its dynabolted to a cement slab, filled with dry river sand and is very solid.
If your using a heavy scope (I'm running a 6" SCT), you may wish to increase the thickness of the top and bottom plates.
Greg
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