I did a very similar repair a year ago for a Pelican member on his '67. The whole car must be done so this area's temporary paint is just that and will be removed and done right when I do the rest of the car's structure.
Anyway, A mouse nest between the sheet metal held moisture over the years (of barn sitting) and rusted the hell out of his strut tower. He had a donor piece given to him by I think Chris Neilson.
The key is to make the repair Strong as new but when done it can't be detected. And as important, prevent this from reoccurring. I use a lot of zinc enriched primer inside the cavities where making a repair.
Anything else doesn't pass on a 911. It requires experience welding. Spotty sloppy welds not only look bad, they are weak and allow water in. Good welding is watertight, and a good polyurethane paint (Imron) is best and even better than factory under the body Shultz.
Unfortunately, I'm too busy right now to take the car as I have a list of people waiting and limited space under roof.
But if you can wait, I can fix this so you won't be able to detect the repair and would warranty it would not reoccur.
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