About SSN's for those who know

A few questions .

Is it true that the hull penetrations are no larger than 26” (Ohio Class excluded for obvious reason) including the weapons shipping hatch?

Are the passageways only 30”?

Why the wood venier? Because it weighs less than paint?

Does Rickover’s rule concerning penetration of the reactor compartment hold in the Virginia class boats? Electric only.

How many folks occupy the ‘attack center’ during a normal evolution?
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I expect to have more questions as my evolution/education continues.

Anyone with any info are clear to reply and will enjoy my greatest thanks.