If you decide you want to weld it.
-Grind the paint from the hole opening.
-Cut small piece of sheet metal to fit in the holes with tin snips.
-Get a little magetic pen to hold the metal in place, weld it. Be fast or take breaks so it' doesn't get too hot and warp the panel.

It will warp a little... Tap it down with a hammer. It really is a bit of work to get it straight again. Might be worth it to just get another hatch.