Greetings,
About a decade ago, I created a game called Aquanautic Imperialis: Battle for the Depths. The game was about submarines battles in the Warhammer 40K universe. I made some MS Paint template for the game and used those to play a bit.
http://bloodandspectacles.blogspot.com/2019/09/battle-report-aquanautica-imperialis.htmlI had intended to sculpt up some submarines from Sculpey, as this was pre-3D printing became a thing. I only got as far as the Ork subs in Sculpey. Finally, on Thingiverse I found a Nemo Nautilus submarine I though had the right feel to look like Imperial ships. After a few sizing attempts and prints I finally got it to what I wanted. I then painted them up with speed paints and this is the result.
Here are the Imperial Subs versus some Ork subs.