Here's the one I built in my shop.
A couple problems with it. One, it's too high. You see, I used a 2x6 as the ledger on the back, and I'd scored a good bag of crack that day, and after marking where the
top of the bench was going to be - and not taking the 7/8" top into consideration - I ended up making that the
bottom. D'oh! I also should have made it 3' deep instead of 2'; you'll see what I mean in the pix. The most useful area is a 4' deep tongue.
It's covered with .060 stainless, and the copper section is where I do welding, so the weld spatter doesn't stick to the bench.
I also made a portable one, 4'x5', which is
very handy for unwieldly projects like 911 cab hardtops

On the portable one, I made a 'power strip' with a 4-plex electrical box, self-grounding outlets and an appliance cord, so I have power right there at the bench and only have to run one extension cord to it.
Then, outside the shop, I have
another metal-covered 3'x8' bench, with air and power routed from inside the shop.
More pix @
http://rennlight.com/shop