Thomas, I just tripped over your thread today... Boy that is some journey you have undertaken, I am full of admiration for all involved having done a fair bit of that myself on my own cars over the years, these days if I was fortunate enough to find a 964 or 993 I could afford, I would be very surprised if it did not have all the issues that you discovered. I suspect most air cooled cars will have suffered similarly by this time. I also suspect many of them would have been repaired using the usual rub down, perhaps some anti-rust treatment, a bit of filler and a coat of shiny paint, and for extra gloss, with a fancy polish process applied to finish it off... though over-spray and painted rubbers tends to give the game away..?
Great that you have kept a detailed photographic record of the repair process which would give any future buyer extra confidence to value the car appropriately relative to the market at the time..should it ever be marketed.
I hope that your engine related efforts provide the hoped for returns that you so obviously deserve..
Having worked on my cars over many years I ended up buying a concours condition car by accident, a friend suggested I MUST go to see it.. and being of pretty basic construction, the amount of effort put into it was very obvious to me... The guy who built the car owned a repair and paintshop and was an enthusiast of the marque, I think he rebuilt it as a rolling display of his workmanship, he did not use it much though did manage a trip to France, but if one has put that much physical knowledge, skill and effort into creating perfection, I imagine any time you hear a stone hit the paintwork there would be an ouch factor which may or may not have induced him to sell it..?
Me..? First day it was mine I took it up an unmade road, stones flying, to get it over with in one go for I wanted to use it, and I have done so, though not enough...(-:
Matters not a jot if you just want to create your vision of perfection and maintain it as such...whatever.. I take my hat of to you, I admit that I smiled when I saw a pic of you sitting in your beautiful car, so well worth all that you had and continue to invest in it... Well done sir and thanks for sharing.