Thanks!
Odd, that's what I tried first and it didn't work.
Oh, wait, do I have to edit the original Piratez.rul file, I remember that editing the Bonaventura worked only then. Gonna test that and a custom addon rul file.
REPORT: yes, it only works when editing the original Piratez.rul file.
A nice location for the Ventura is behind that small door on the level that leads to the roof.
craftInventoryTile: [6, 4, 2]