I suggest a damage system

Here is the factors
Projectile dmg: 150
Fuselage health: 100

The Projectile hits a fuselage, if "Projectile dmg > Health" then the fuselage block will break, then calculates dmg on the fuselage connected to it

The dmg will get subtracted by the health of fuselage that was hit, so the fuselages connected to the fuselage that was hit will get 50 dmg, because "health - damage"

Then if the projectile dmg reaches 0 or below, then it wouldnt damage anymore obviously

This is a damage spread system

If you cant understand,

Projectile hits fuselage, it breaks if projectile dmg is higher than health, then projectile dmg subtracted with fuselage health, then the fuselage connected to the broken fuselage will get damaged by the result of "dmg - health"

This system can be exploited by using a lot of blocks though