MINIALAND has released another 3D printable vehicle. This time an RC Ford GPA that swims. Looks like a nice project for printing. I'm thinking it might need some attention from the printer once the KV-1 is done printing.
https://cults3d.com/en/3d-model/various/carrosserie-ford-gpa - main body
https://cults3d.com/en/3d-model/various/notice-de-montage-ford-gpa-rc - instructions are free so you can read them before buying to see what you are getting into
https://cults3d.com/en/3d-model/various/accessoires-ford-gpa - accessories
https://cults3d.com/en/3d-model/various/systemes-de-propulsion-terrestre-et-marin-ford-gpa - land and water propulsion stuff