I'm in the process of building a forge and need some info. My plan is to use 2 stainless steel containers, one is 10" diameter and the other is 7". I intend to put the smaller one inside the larger one and put insulation around the outside of the inner container. Is there anything wrong with doing it this way?? The inner container would be the actual burn chamber with stainless walls that have insulation on the outside. This would leave bare SS inside the forge and exposed to the burner. Will it work??