CHEVY CHASE Panel Says House Is Over the Line Unhappy Neighbors Want Walls Moved By Miranda S. Spivack Washington Post Staff Writer Thursday, June 8, 2006; Page B02 Marianne and Marc Duffy say their dream home renovation in Chevy Chase has turned into a suburban nightmare. Their neighbors say the Duffys intentionally flouted building rules when they expanded their $725,000 house on Thornapple Street and have no one to blame but themselves. Yesterday, a Montgomery County appeals board reaffirmed an earlier ruling that the Duffys had rebuilt their house too close to the street and to neighbors. The Duffys say...