[tec] How to make a ship object really hard to destroy?

[VonDos]

Hi everyone!
I've a question:
i was working on Titanic;
for the high details number, i must divide in 2 the semplified model: main hull (red and black, i've call 3dmodel file "nlus_.obj") and superstructures (white parts, 3model file call "nlus_comanda.obj") over the hull;

Now normally work really good, but there is a problem: if i hit white decks with deck gun, they'll explode and destroy like for examples lifeboats in normal ships, and the hull will remain alone with funnels and other details
The same if i torpedo some ship's zone.

Voilà an image for clarify:



There is a solution for make superstructures as resistant as main hull? What file should i mod?

It's a damage zone issue.
Send me a link to your files and I can look at it for you
if you wish.