All the meetings with contractors and engineers have left me with a feeling that my house is in pretty good shape, not at all screaming for demolition and replacement.
It has some quirks of course, and even if it has held up for 50 years it does have some "faults", like a level difference of 1.8" on the west facing side: one corner is way up, the other is way down. But the rest of the house has only differences of .6" which is really nothing.
Here are the level measures inside
In connection with a bid for wrapping my crawlspace, one of the contractors provided me with a free-of-charge level measurements using a zip level. It was relatively good news. The level difference is mostly within .6" except for the SW corner (the blue bedroom) the west facing wall slopes 1.8"
West to east - N side: 1.1 0.6 -0.1 0.0 -0.1 -0.3
BRw BRe BA BA/corr study LRw LRe
West to east - S side: -0.7 0.0 0.3 0.4 -0.1 -0.6 -0.4