why not try and cut down (even dictators can run out of cash to spend of vanity projects ).
may I suggest,
Main shore bombardment guns - 2 80cm (2X1) maybe limited traverse like 18inch on HMS General Wolfe between funnels such as modern harpoon launchers ?
Main Ant ship guns 8 15 inch (4x2) Bismarck style ?
Heavy DP guns 20 12.8cm (10x2) 5 each side copy US battleships ?
Light AA 5.5cm or 3cm as many as can fit ?
you might get a much smaller ship