Jim Weir wrote:

What NONLUMBER bench tops have you ever seen or considered that might work?

Sorry, I misunderstood. Since you put it that way, none. I do have an old table
saw base and top that I use for metalwork, but I think you will not find one
that's six feet long. Anything else I can think of is either too flimsy or has
a wooden base structure (like Formica kitchen countertops).

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.