This is what I did to a small but good vice for loosening the bbl nuts on an AR15. I do this with a lot of stuff so it takes up little room and can be put away when not in use. I use deep clamps and have never had any trouble. Taking a bbl nut loose is a HEAVY strain and this handled it fine.
All of it came from Lowes Hardware and was well under $100.00. The vice is bolted with flange/blind/lock nuts underneath the 2X6 and I'vw even used it to hold mower bladea for sharpening.
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I like the idea of mounting it to a big board.
Right now I'm going D'OH! and slapping my head for not thinking of doing it. I'm tight on garage space, and bolting a vise down on my small workbench would just take up too much space.
Personally I wouldn't waste my time or money on the cheap Lowes and Home Depot stuff. Head over to Craigslist and find yourself an older Wilton, Reed, or Prentiss.
I was going to suggest craigslist. I've gotten some amazing deals on there.....