I just unpacked my welder and I got these great panel clamps that I ordered. At some point I'll order the cab corners and patch panels to start. My question is, how do you measure them out to cut? I've seen where people place the new panel over the old and use a Sharpie to mark out the lines. I assume you cut on the scrap side of the line. What thickness of cutting whell do you use? Have a .040 wheel. I'm going to practice first. I've got plenty of scrap. Input please!