Sausalito houseboats have been on the reclaimed wood train since way back when it was called "abandoned boats you could jerryrig." This floating gem, designed by David Spurgeon, reimagines the form: what if the overhang protected the interior so you didn't have to close the windows to rain? What if it were wide and flat like a floating leaf? What if passive solar and hydronic radiant heat meant eco-friendly resistance to cold weather? Here's your answer.