Another option is just making ports on the side that open up for the canons. So basically like a pirate ship, but it'd be invisible so no one would be able to see from the outside. Either way, easy peasy once I have the stuff.

[He gets where Percy is coming from, and maybe it's because he's still new here, but he does not trust this to go peacefully.]

I just don't want us to get out there and get blindsided and have no way to defend ourselves. We're demigods, nothing ever goes easy or simple for us.