Furthermore why Fubuki class? The Japanese know they have flaws, hence why the Asashio class existed
Anyways assuming same cost ratio vis a vis a Yamato (destroyers are on a different cost curve than battleships, so just hoping for relative ratios) as a Fletcher vis a vis an Iowa, you're talking 17 Destroyers each, or 51 total. Let's be optimistic and make it 60. Of course you need to find an extra 3,000 sailors to man the Destroyers, extra 5,000 if you are optimistic