The problem with the bridge crew would not be fixed by that. They are considered INSIDE their hull section. That section (regardless of angle it's attacked from) must be penetrated to hurt them.
The problem is that it is a section of the boat like any other, and all the guys INSIDE the boat in that area get hit, too. So, if you make them vulnerable to small arms and even 20mm, the boat will be sunk by the first DC that goes off nearby. Also, the guys below get killed, too.
tater
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