I am finally getting around to building my RF smoker. I am using a 100 gal propane tank. I have used the calculators to figure out what size fire box, exhaust stack and air inlet sizes i need. My question is I have a piece 1/8in plate is that thick enough for fire box or does it need to be thicker to hold heat better and what works best for hinge's? I thought of making my own with round stock and tube.