I also use 2x12's laid side by side- 6 ft long, 3 feet wide. I then screwed an sheet of 1/2" B/C grade plywood to the boards (B-side up) to make a very sturdy and smooth surface to work on. I currently use a 2x4 frame for legs- very stursy, but I'm going to upgrade to 4x4 posts if I ever have the time.

Alcohol, Tobacco, and Firearms... who's bringing the chips?