SurvivalBlog reader J.C.S. recommended a site by a gent that used school buses to build a fallout shelter: http://www.webpal.org/webpal/index.htm
Doc at http://www.bigsecrets.cc recommended this site: http://www.undergroundhousing.com/ Doc says: “The author of “The $50 Underground House Book” did not start out to design a livable fallout shelter, but that is what he did.”