Actually I have zero experience other than hacking the files for the Type XXI to give me USS Nautilus performance, 25~ knots submerged...
Link
Here's a ZIP file with the original 3DS I found and a conversion of it to OBJ format.
Hopefully, some of you bright folks can replace say, the Type XXI with the Nautilus and a few other ships with 1860s steamships, and we can have a VULCANIA campaign (Based on the Disney version).