Software billionaire David Duffield wants to build a large home. Make that a very, very large home. Maybe the biggest home in the United States. Bigger than Bill Gates. Bigger than the White House. Let the criticism begin. Thomas Lifson   10 08 05 Dennis Sevakis adds: How 'bout 175,000 sq. ft? (That's four acres of ground covered by the structure).Mr. Duffield has got a ways to go before he beats the Vanderbilts.  (Read Full Post)