I said I was changing the guns to 20.5 inch from 31.5 inch.
Although that is better than the massive 31.5 inch guns you used on the George I, 20.5 inch guns will still pose a hefty amount of tonnage on the deck and under-deck equipment. I know you are going for a vessel that is based and inspired by the Yamato, but I'd suggest going with 18 inch guns.
Also please do not forget that you need to remove most of those portholes on the hull and superstructure.
I'd suggest looking at photos of various battleships and looking at drawings in the SB archive to help you with designing your ship correctly, looking at real life designs, along with additional research can help considerably with designing AU and personal ship designs.
I re-read my original message, I apologize if I was rude in anyway.