M2 Destroyer of the Terran Military in the X series games.
The game itself isn't very well known although I have gotten a liking to it due to the game's depth in space combat and interstellar trade (putting aside the atrocious voice acting)
The Osaka is classified as a destroyer in the game but it is nothing less than a battleship. In-game it houses 12 anti-ship batteries (4-front, 4-left, 4-right) and 12 flak batteries (4-top, 4-bottom, 4- rear), all of which are operable in the Minecraft model. In-game it has a top speed of 194.4 km/h, a maximum acceleration of 7 m/s^2 and maximum steering of 0.9 rotations per minute. Speed is not this ship's strong suit but after all, it is a capital ship and thankfully speed doesn't matter in the Minecraft World.
Assuming the blocks are 1 x 1 meter in measurements, then this ship is only 1:4 scale :D

Additional Notes

The Interior has little to nothing inside it, I'm still making the modules for the interior however given its size, I won't be done with this for quite a while. The cannons however are operable, the anti-ship batteries are twin barrel gun-rammed TNT cannons and the flak batteries are twin barrel fire charge dispenser cannons. The guns just need to refresh the loop clocks located on either the top (flak batteries) or behind (anti-ship batteries) in order to begin a safe firing process.

POSTSCRIPT: 18/11/2018
It's been years since I posted this on PMC, and I doubt any work will be added afterward. Ask for my permission if you're gonna use/edit regardless.
I've also added screenshots using MCEdit 2, cuz I couldn't fit the entire thing in MC.