what i am wondering as i am a novice in this area well i have extra quater panels i wanted to use as a template to form lower panels behind the rear tires what stumps me is how to create a lip that would seat inside the quater panel creating a backing to weld the seam and have the cut/seam to be flush ,was also going to drill holes in the outer portion {like a spot weld } and weld the inside lip of replacement panel to the outer original panel . so my quest ----- is there a tool to do this ? another ques what gauge is thick enough ? what i intend to use for a welder is a wire feed non gas mig and it only has a min/max amp setting and running .030 flux core wire hope it makes sense thanks