Yeah. it's thick steel with a 2" gap. That's about 2.5" deep from the inside of the inner box.
Here are a few more updates:
The first three are shots of the table. Constructed the frame. Added it to chamber. Placed stainless top on frame. We'll either remove it before painting or wrap it. On the last pic, you can see the stainless flanges on the inside of the chamber.
This is a quick shot of the smokestack hole. 6x6.
The next two are shots of the grease trap/valve. We have this coming down through the bottom of the trailer.. keeping it out of site.
This last one is a shot of the whole rig..Man...it's starting to take shape more and more.. I'm getting excited. We'll probably be cooking out of this bad boy in a weekend or two.