This would proably be the best forum
Green/Energy-Efficient Building and Construction. I'm confused with the meaning of your post, are you implying since the guy isn't giving you blueprints/plans for Free that he's a greedy money loving whore? Surely everyone needs to make a living, even if they are a non-profit group, the bills still have to be paid.
Now as far as the buildings themselves are concerned, "EarthShips" although in princial it's a good idea, and may work fine most of the time, he does not take to account the extremes what may occasionally happen. For example an area experiencing an extended drought wouldn't get any rain water to use for the house's water recycling system, or an extended heat wave or atric freeze could make the thermal mass of the house too warm or too cool over time. This is why most alternative building methods still stress keeping the house connected to the grid.