I've been working on/continuing Civilian Population Revamp, based on @michaelhester07, @rabidninjawombat, and @GGumby's collective work (found here, here, and here, respectively). I'm excited that it's gotten to a state where I think it can be shared (but still not released officially).
Key Differences between mine and the above:
Civilians are now full-fledged Kerbals, instead of being abstracted as resources
There are now two methods of growth
Linear growth by Civilian