So, a metal fab shop quoted me about $300 to $500 to make a door for my firebox. Dimensions are rough opening 12"x20" but I could knock down the 20" if needs be. This is way too much for my plans. I was trying to come up with a cheap alternative and wondered how a cake pan (12x18) screwed upside down into some wood would hold up? I figured the air space between the wood and the pan would knock down the heat enough to keep the structure from catching fire... I was looking at either an aluminum deep cake pan (sheet style), or a steel not so deep cookie sheet to use on the door. It will have a vent hole in the pan and the wood part of the door so that hopefully the draft would keep the heat away from the door. Its a charcoal smoker in a brick firebox with a wood enclosure around it to make it look purty =) Thoughts? also, would a cookie sheet hold up under the fire to allow me to slide out the basket and add more charcoal as needed?