Good idea, but you are forgetting about the one single element that totally devistated the Japanese navy thoughout WWII......

FIRE!!!!

Fire is the worst enemy of any ship at sea.
The Japanese fire control aboard its' ships was nothing short of terrible! It is what cost them the battles of Coral Sea, and Midway! Yamato had very thick armor agreed, but it still had wooden decks! Wood burns! One hit by Bismark, could totally paralize this great ship!

Just look what happened when the Americans sank Yamato! (and Musashi!). After the first attack, she was on fire, and after that was never able to defend herself! It was only a matter of time. She put up a good fight, but in the end still when down!

I agree that Yamato would win this scenario, because of its' bigger guns, and better range! Not because of its' armor!

Matt