Check out: <a href="http://www.fabprefab.com/fabfiles/home.htm">FabPrefab</a>
If you don't know about this, I suggest visiting it. You'll find lots of interesting stuff there about this sort of thing. I myself am very interested in this as well. Here are some of my personal favs:
<a href="http://www.rocioromero.com/home.htm">Lv(L) House</a>
<a href="http://www.mkd-arc.com/index.cfm">The Glidehouse</a>
Hope this helps... If you wanna chat about this further, feel free to e-mail me too. I love this sort of thing.
Bon Vie, Good Life.