There is a thread on here where a fellow was asking for help in using his smoker, he is having some troubles with it puffing like an old small block Chevy when he is adding wood. Seveal folks commented that the wood needs to be "preheated" prior to putting it in the fire. I am planning on insulating the firebox. The inner parts of my firebox will be quarter inch. Have a sheet of 14 gauge, think that is what it is...it is about. 080" thick. Will that be sufficient for the outer skin? Back to the warming matter..I was thinking about extending the top of the FB a few inches to add a warming area....box would look something like this... Someone mentioned the potential of the wood in the warming area igniting. Would only be keeping the next 1 or 2 pieces of fuel in it so it would only be in there for a brief period. The floor of the warming area will be quarter inch, it will actually be the roof of the FB, will be the top of the opening. Firebox will be 16" or so tall, ain't like the flames are going to be pounding the roof of the firebox?