Sausalito houseboats have been on the reclaimed wood train since way back when it was called "abandoned boats you could jerry-rig." 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.