Thanks Guys! I'm happy with the way it came out. I actually used 16 gauge for the main flooring where I sit and my legs and feet rest. 18 gauge for the rest of the non tunnel flooring and 22 gauge for the actual tunnel. I had brought the fabricator a piece of 22 gauge just to play with, but when he was done I felt it was going to be just fine with the thin stuff. It is actually quite sturdy.
Arno