I love Rivas. I guess basically the Italian Chris Craft but possibly a higher end. Lots of movie stars back in the day bought them, in particular, the Aquarama. Some of you may know the story. Ferruccio Lamborghini decided to purchase one in '68 but decided the standard engines weren’t enough for him. As it turns out, many items were not adequate for him. He collaborated with Carlo Riva and had a special one-off Aquarama built with two 4 liter Lambo V12 engines. Riva had his assemblers spend around 3000 hours to reach perfection. Very cool. Here is a quick vid showing a test run after an extensive recent restoration by Dutch Riva. The second link is a lost and found story of the boat.
https://www.youtube.com/watch?v=0LkQbVTWr4g
https://newatlas.com/lamborghini-riva-aquarama/29402/