The result of various conversations over the years, this design has been sitting in my mind for a while.
This is but one iteration of what such a structure might look like. Its far more likely that re-use, patching and scavenging will keep the existing housing stock viable for decades after the fall. That’s not to say that we’re living now where those who follow us will need to.
New structures, using whatever knowledge and technology we can still wield are going to be a necessity.