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Suggestion, just contact Mr Kushima via his contact email on his website and ask for either a translated manual or a digital version of the manual in japanes for easier (online) translation. You can write your message in English and add a version translated in Japanes (use Google Translate or any other online translator) with the original message
The latter method works perfectly for me when I have to communicate in any other language than Dutch or English

Hi Foute Man,
That's a great idea, I've sent an email in my very best google-translated-Japanese, with my Yamato and donation receipts as well as a confidence builder. Even if I can get the Japanese version I'll be on a winner as I was able to do that for a free submarine I got online there a while back.
Fingers crossed!
Alan