I've seen the greensteel house (St. Theresa model) at Evening Rose in Tallahassee. It would be a nice quick-and-dirty guest cottage or rental. It was not exactly clear what was included in the "100/sq ft" price mentioned (porches, stairs, landings?). That home is just over 1000 sq ft and is listed for sale by k2urbancorp for $249,900.
http://www.frogrealty.net/listingvi...C&sortby=price&listingID=180&pid=7§ion=k2
From a design standpoint, the lack of storage was a problem. That partcular model home was brought down from somewhere up north. I don't know if they have actually been able to manufacture any in Carabelle. I believe that lenders will treat this as a trailer for loan purposes, but could be wrong.