Kep where did you get all of that history. I work for CA State Parks (12 more days of vacation before retirement) and have heard the information offered at the tours but don't remember it. Just checked the webpage and saw the information you posted. I was going to suggest you apply for work at the Sierra District.
I love Lake Tahoe and plan on kayaking it as much as reasonable after I purchase a 2009 Adventurer. Let me know if you are interested is sharing some lake time whether it be pedaling, sailing, or fishing. Next year I plan on touring the perimeter of Lake Tahoe at a leisurely pace of 2-3 weeks.
BTW the boats you encountered were most likely from the 2008 Lake Tahoe Concours d'Elegance
http://www.laketahoeconcours.com/ . The show is in August though they are there for a month or so. There is an aluminum boat on display (all year) near the Hellman-Ehrman Mansion across (lake side) from Sugar Pine Point SP. They also have a wooden canoe on display near the dock.