Richard, I have a CRP -4848 I built for myself. I built the table to place the table height at 35". I chose that value mostly because it was at a convenient height to match my steel saw horses, which made it easy to support work that hung over the table. One problem with making the height too convenient is the CNC table is another horizontal surface to collect tools and projects when not in use.
-Freeman
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CRP-4848 CNC Router, CNC G0463 (Sieg X3) Mill, 9"x20" HF CNC Lathe (current project)