Hello all! I am building a propane forge out of a 5 gallon craftsman air tank. I calculated roughly 550-600 cubic inches of space with all the refractories in place. However, Im still undecided as to which burner configuration to do. Will two 3/4 burners be sufficient? Will one, 1" burner be ok? I had my heart set on using t-rex burners. This forge will mainly be for knife making. thanks all in advance