So, I'm building a gas forge, very small for now because I'm not planning anything larger than a pocket knife. I'm planning to use firebrick for the forge due to being cheaper than refractory cement, and a single propane burner, probably just the simple kind of gas torch you can pick up at the hardware store. The questions I have for you guys are, do I need a shell for the firebrick? Is firebrick a good material to insulate a forge this size and capacity? Will my plan for a cheap gas burner work well enough to heat steel? And finally, what would be the best way to position the burner to be the most efficient? Thanks in advance.