The base: Three (what have become something de rigueur for GIS builders) saw horses spaced 2' apart. See plans and instructions here
The saw horses are topped with two 2x10x10' planks (end to end, centered on the middle sawhorse).
Tomorrow the planks will be shimmed to match end to end and edged with 1x4s. Then topped with two layers of ply (3/8" because that's what I have on hand, and 3/4") 16" wide.
Actual assembly of the boom should begin tomorrow!
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