[yetibone]

I had to do repairs like that on my Bug's body. 5 total, and I used a '69 model for a donor.

Remove all the foam. It'll catch fire when welding, and the smoke will contaminate the weld.

When doing the repair to the window corner, It's a good idea to remove the spot-welded part at the rear window opening so the new metal doesn't overlap the old layer. If it did, the window would be hard to reinstall, and would not seal up watertight.

I'd suggest cutting out the remaining piece above the rear deck-lid, to the left of the vertical grille, and below the already removed section, and graft in a larger piece of metal. Only reason being that there'll be one less butt-weld to do in a tough to re-shape area when you stitch the new piece in.