deguerre.... Thank's brother to me the door sytem we use allows for no warpage and it seals really good. It by far beats slapping a piece of plate againt a piece of plate, and eliminates the use of any stiffners on the doors. We use the same setup on our firebox. I have no secerets and and do not care at all if someone mimmicks what i do. To me it is all about people helping people who have the desire to cook and build. Again thanks for the comments!!!