I was at Walt Disney World in... 1974? They had a display of a Nautilus model. It may have been THE Nautilus model. Dunno. But it was displayed kind of like that with a lamp that made it look like it was underwater. This looks similar.
Fantastic! I've been following this since the beginning. The amount of detail is mind-boggling. At a length of 200 feet (discussion at nautilus submarine), the Nautilus at 1/12th scale would be 16.67 feet long. I was at Disneyland in 75 and they had the 20,000 Leagues Under The Sea ride where you go inside the Nautilus and ride around a small 'lake'. Sadly, it's gone now (although there's one in Japan).