[DWilbur]

My builder screws the parts together by drilling a hole and installing screws by hand so he does not warp the metal. I asked him why by hand. he said that screw guns you don't have control how tight the screw grabs and it will warp the metal. I noticed that you are step notching the cab you are working on and the corners are not stepped do to the tool not able to reach the corners. you might try stepping the part so you can step notch all the way around. looking good