i'm building my first forge and have a few questions. i'm using a standard 20# propane tank, i cut my openings front and back which are 8" x 3". i was wondering if i will be able to line the inside with kaowool thru these opening and be able to line it correctly, or do i need to cut a swinging front door to easly access the inside of the forge. also, i was wondering if anybody had any recommendations whether i should use one burner or two. i am only interested in forging, no welding ( i like my mig and tig welders) i am also open to any suggestions on what you see. thanks in advance.