U.S. copyright registry of vessel hull designs

I recently stumbled across the U.S. Copyright Office's Registration of Vessel Hull Designs, and it could be a valuable resource for certain researchers. The Vessel Hull Design Registrations list seems to extend back only about a year, and has a lot of entries that indicate changes to existing designs, so the number of designs in the registry seems very small at this point, but shows a variety of vessel types--inflatable boats, many fishing boats, a racing kayak, sail training craft, even a "pleasure mega yacht." The certificate of registration as well as any accompanying drawings or photographs are available as Adobe Acrobat (.pdf) files, which are often quite large, but very interesting once downloaded and opened. In this respect, the database resembles Google patents, since the accompanying visual materials are available.