If I remember correctly, there was a dude in El Bolson that was pretty famous for earthship style homes and would put on seminars. I would be very tempted to go back; loved the people, steak, and the beauty of the wilderness down there. If you offer something definitely post it on here!
Discussion
Love that idea, I've got a connection that builds earthship style homes and buildings that would be worth the time. He works with giant tree trunks, recycled tires, recycled bottles, and the earth on site. Amazing artist/architect/builder.