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Roy, For purposes of comparison, Delta 14" bandsaws use 16 gauge sheet metal. Staying with 16 gauge will have a couple of advantages. First, the metal is cheaper. Second, many small sheet metal shops (e.g the small HVAC ones who will do the bending for you cheap) have benders that are rated for 16 gauge and thinner. The clinker in this is that commercial covers are stamped and the slight crown and other stamped-in details add rigidity -- meaning less vibration. So, if I were you I'd think 16 gauge would be OK, but would be prepared to bolt/rivet/weld a stiffener or two or something like a Bituthane liner if you get vibration. As far as cost, I've had the best luck with small shops where you can walk in and talk to the guy who will actually do the bending. On my latest bends (stainless steel bench tops) one shop wanted to give me a quote. About $100. Another guy did it for free at the end of the day -- took us maybe 15 minutes working together and I gave him $20 and thanks. Naturally, 14 gauge will work but the cost will go up. Hope this helps.
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