New 408 build finally started

So I hooked everything up, practiced for five minutes and welded it up. Weld, grind, weld, grind, flip it over and burn it in from the inside. It now passes my prick test poking it, tapping on it, and prying on it. My reading said if possible when welding aluminum back it up with brass or copper so I laid a piece of brass bar in there and jammed it tight. Seemed to work good.