Does anyone have an STL file of just the liberty ship ribs and keel? I tried tracing from a PDF but it didn't turn out well at all.
I thought I saw a thing on Thingiverse a while ago, so I did a search. Try this: https://www.thingiverse.com/thing:4411101 A bit more than just ribs and a keel. Not originally intended for combat, but I'm sure easily converted. If the hull is thick enough, just cut some windows and sheet with duct tape.
I printed an older version of John Buttery's Liberty ship model several years back. The newest version looks like it'd be easier to assemble.
Here's my build log for my 3D printed Liberty ship in 1/96 scale. What to do with a pair of 3D Printers? Liberty Ship Build - RC Groups I ended up creating some additional detail items that I uploaded for free to Thingiverse.