I have a 4'X4' welding/layout/chalkboard table 3/8" steel top, I've had it for25 yrs.
The top is no longer flat and I don't recall ever pounding on it.
I'd say go as big as you think you might need and space will allow (6'X12' wow!) and 1/2" top. But even my 4x4 is hard to move.
A lot going on with that simple design, graceful and aggressive.
Is that a magnet chucked up in the vise?
FIRST KNIFE:o I had to come back and look again, Very unique, you've got the stuff.