I am another newcomer to the steam scene. Living in Vancouver, Canada, I have been around been around various sorts of boats (excepting motorboats) for many years. Not sure now how I first became interested in steam, but now I find myself with a nice little steam engine in my living room:

No, I certainly didn't build the engine. It was built by Don Mentzer in Medford, Oregon. The engine is a 2 1/2" x 3" single, and now I need to find everything else. Right now I am planning on building a boat around 16 feet long, which should be about the right size for the engine. A bit smaller than most of the steamboats around here, but smaller is more convenient in many ways. Getting this boat completed and operating should keep me out of trouble for some time!
Harald