I have with the help of a friend designed an outdoor kitchen that I would like to build with the help of some of my friends who is very good at Sketchup as you can tell in the images below. He pointed out to me that with the veneer stone I will be using with a concrete board, the flanges on the door unit have nothing to screw to? He sent along these images to give me and others a point of view. As you can see the flange on the door is only 2 1/8" and the stone + concrete board are 2 1/4" which leaves no steel stud to screw them into. He suggested that I could insert the door frame and then cut the stone around the frame, but I really want the frame lip to cover the edge of the stone all the way around for a clean look. I will attach all the images he sent over for a better look. Thanks for any help as I am wanting to get started asap. One other thing, I asked if he was sure that the dimensions are correct on the door unit and he said that he used the line drawing that the company of the door sent him??