EDIT: I removed download link for standalone version of this ship, because fixed and improved version is already available both in TWoS, and for non-TWoS players in my mod The Little Ships
Got to stay at home much longer than I'd usually like so I dusted off my old modding projects, and I have something to share with you
After a lot of trial and error I finally managed to make a working GR2 format ship:
It's a small 250 GRT coastal merchant. I used NF_boat_1 as base template so it won't break in half but other than that it works fine.
Some more screens:
https://imgur.com/a/0h9ooBs