this will leave the panel behind it nearly perfectly intact but then you will want to grind off the pieces left behind.
this will do some damage to the underlying panel but shouldent put a hole in it.
Also they sell a
spot weld gun that you can connect to a stick welder or decently powered GMAW machine. I'll be welding my quater panels on with a 110 mig and some .023 wire, You might want to check out the
plug weld pliers that they have available as well. Another thing to consider is clamping pieces of 2x1/2 copper flat bar around where you will be welding to keep the heat of the surrounding metal to a minimum
Eastwood also sells something they call
cold shield that should help prevent panel warpage when you weld or lead the new panel on.