Unfortunately, in the case of IJN stuff, just about everything was destroyed as the war ended.
It's a shame really, because there's written reports of hundreds and thousands of ship photos and naval documents being burned in large bonfires at the end of war.
It's sad really, that only 1 photo is known to exist of Shinano, only 3 exist of Taiho, and only a handful of Yamato and Musashi. Compared to the likes of the Iowas (at least during their wartime careers), or even Bismarck, the IJN stuff is rare.
At least to me, it's perhaps the most fascinating navy of all the combatants of WW2. They certainly had some pretty ships.
I'll get those deck patterns scanned tonight for you.
Jeff