Jim --
I didn't do any 'under table support' on the front of my table - with the exception of a leg to table top brace... Where as on the sides and all across the back side - I used 3" angle iron welded intermittently to make sure the top stayed flat.
The reason nothing in front - CLAMPING... I wanted a place to be able to use any kind of clamp without under table interference. In the back - I stepped in about 6 inches...
My floor is level - so I didn't have to do levelers of any kind.
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