Think of it like the Russian Sniper Rifle, the OSV-96. That barrel folds and fires just fine.
Where did you get the "expanding the hull" statement? I don't think i ever said anything about expanding the hull...
There is a significant difference between small arms and naval guns. That is about the same as comparing a fircracker to a 500Kg bomb.
And you already have "expanded the hull". You seem to think that taking a Zumwalt and making it 200+ meters long will yield identical results. No. That doesn't work.
This design is fundamentally unworkable. You say you ran it through springsharp and that it is "floatable". So? Driftwood is floatable, but that doesn't make it a warship.