In the prepper community, there is a subculture who considers what it would take to survive the total collapse of civilization and rebuild "after". For example, let's say we had such a total collapse of the world economy that it took down product distribution networks and the power grid failed, not for a day or three, but that it just went down and never came back up again.
Yes, some people are a lot of fun at parties.
Open Source Ecology is building the Global Village Construction Set, a 50 piece industrial machine setup that would allow you to survive with style. Interesting concept, assuming you could scrounge up the knowledge, tools and raw materials after things have went all Mad Max.