How about someone will help you?
If no one till today, I will help it.
I can make a new ship slot to your PT boat.
But now I cannot edit your 3D about collisions, damaged models, they have to be finished by you.
When you wish,
please send me a PM with your msh folder zip URL,
and armaments list you made in 3D (like Head1.msh = 40mm Boforse, Head2.msh = 20mm Oerikon, ...).