Hello Specki,
thank you very much for your cost breakdown. You really worked hard like a "well cleaner."
I had calculated something similar (100,000) for us, with conditions similar to yours. A two-family house, built in 1967, a friend who is a civil engineer had looked at it and given the green light. But we decided against it. Simply because of time reasons and because it would be too far for us, we could only go there on weekends and do some work ourselves. It would never get finished that way.
Now we are only planning the renovation of mom's condominium for 2021.
That is also why I registered here newly, to look for ideas.
It's a pity that it didn't work out with your pictures.
Best regards, Wolke