Just a thought. When I built mine and cut the door out it "sprung" about 3/4 inch, guess it was relearing tension from years of use as a pressure tank. Anyhow, you might want to check the fit, especially after that hot burn, if you need to tweak it a little it would probably be easier before weldingbthe hinges on. A little care now should help insure a good airtight fit.
Got a bunch of cooking toys and a custom metal fabrication shop where I spend my time building all sorts of smokers & outdoor cooking gear.