I went to a lecture at HMM a few years ago about the Hawaiian S-boats, and I thought they said all were now gone. On one of them, the owner had removed the frames and glassed over the inside. Frank McCaffrey was a moderator, I could see him cringe.
I've been on Nautilus a few times, although never sailing. The Pedersens are wonderful - Bill designed the interior, and I love it. They've sold an interest in Nautilus, but I think kept part ownership. They also owned the original Araminta, now at Mystic.