Tempting, even at this price.
Otherwise, cross-referencing various blogs and pages against visible official numbers and names can take a lot of time; when the names are written in hiragana or katakana letters, that's not so difficult, but since the Japanese ship names are mostly written in kanji symbols, deciphering them can become a real task...
IHS database that I use has been a great help for me, but this Japanese register would be the best source, obviously.