I didn't actually measure on-center.....so it might actually be closer to eighteen instead of twelve from my own pics.
I'm an area-code carpenter.
Shame on me.
There is a full week scheduled ahead to get rid of all the remaining nob-and-tube.
(That Greenlee outlet tester goes off half a f'kin foot away....)
There is also some braided two-wire which is less of a concern to the electricians, but will also get taken care of if they have the time.
Pics of the project:
