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make sure , if you replace the piece in a small section (which I would advise) that wherever you make the cuts, you can get back there with a dolly so you can hammer and dolly your welds.
Door patching is tough with to much heat and very easy to warp the door.
Make a tack every 2-3 inches, STOP between each weld and hammer that tack.
If you do this, its just enough time for the panel to cool down, then do the next weld, then hammer it.
You can just move at that pace for the whole job, and do it all in one session provided you stop between each tack and hammer it flat.
make the space between tacks 50% each time you go around the piece.
Eventually its all welded up with no warping.
Tig creates more heat than mig, but tig welds are easier to hammer flat.
I would just cut it out and make a piece to fit...
Restoration-design.com may have a lower door skin...or maybe even just a corner...not sure.
Grind some paint away from the whole door bottom...see how far it goes.
RIch
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