Best Spot weld cutting method

You guys are working and thinking too hard on this, drill an 1/8 hole thru the entire panel, and drill a 1/4 hole just in the panel you want to remove, knock the junk panel off with a air chisel.
Mark the new panel from the back side with a sharpie, drill another 1/8 hole and the new panel and burn it in with a mig.