I like the idea of a "pen pal" environment - that takes care of
  the larger community sizes or multiple communities. I'm thinking
  of the process too --the reason why I mention room by room. it
  starts out with an idea. Then some funding to get it started.
  then the first bedroom, and the start of community centers. You
  gather other people. Their rooms are built. Start it off right,
  so yo udon'...t run into issues later on. You could host
  retreats to raise additional capital. (school trips, weekend
  learning sessions0 - it owuld ALMOST be like a summer camp but
  year round and people lived there. Now it's reminding me of an
  RV park -- HEEEEEEEYYYYY - THAT'S IT! Use existing technology
  and existing resources: Buy an old campground to start! plumbing
  is there. Get trailers here and there, fix them up. The
  community centers are already there - the bui... "