Interesting! What kind of metal did you use and did you have to install some kind of sacrificial anode to ensure that it won't oxidize away over the decades?

I used stainless steel sheet. Where the anchor bolts were, a largish hole was punched in the sill plate so the stainless wasn't in contact with the iron, which would have resulted in galvanic corrosion.

The contractor groused about it, because he wasn't used to doing things that way. But he got excited about it after a while, and on his own fabricated stainless steel inserts that the windows would fit into that would prevent any leaks and rot around the windows. He was pretty proud of his work :-)

Another thing the book recommended was putting ground glass into the concrete mix, as rats won't chew it. But I didn't go that far.

The main thing is to make sure any gaps and vents have wire screens. Mice can get in where the plumbing enters the house, you can stop that by ramming steel wool between the pipe and the house.