Isn't that brilliant! Something similar could be done here but maybe for a little more than 150lb's (such a computer pleb, can't make the pound symbol work - actually I haven't tried, it is blue and I'm scared that if I try to get it to work I'll make something else not work!). Just got to find the appropriate materials maybe. There are several straw bale houses near by us and they are very very insulated - warm in winter and cool in summer. Always fancied one of those. I also like the idea of sandbag houses - sandbags filled with sand/soil/cement blends - lot of work but most the materials are free. I have a book on that. One day I'll do it! But not for that cheap, it will be thousands, maybe even 10's of thousands but certainly not what regular new houses cost.