Computers Bridge Crew Quarters Life Support Oh My

[brianeyci]

When you add a master computer, you can add unlimited number of bridges, crew quarters and life support.

What is the to-hit modifier for a ship that has a disabled bridge/crew quarters/life support, and would adding say 150kt worth of bridges crew quarters and life support prolong your ship's life, especially when dealing with null-space weapons? Anybody ever try this?

Brian