I can build almost anything, and some things I haven't tried yet. When I look around at all of the wastefulness of consumerism, there's one aspect that doesn't seem to come up: Suburbia is full of tools and materials: enough to build an amazing new system of communities if we could only (to use an anachronistic term most don't think much about) "superintend".
www.opensourceecology.org might be a place to begin.