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The New Shay is also in metric, at least my copy is. All his books are still in print, can be ordered from the publisher, Village Press, if not found elsewhere. Camden Miniature Steam carries them in UK. https://camdenmin.co.uk/search?q=Kozo
Designs that used to appear in Model Engineer and the like were then published as a set of drawings
I'd never built a locomotive before this one. I used LBSC's Words & Music throughout the build. I found the instructions straightforward and easy to follow. I didn't find any errors, and the design certainly wasn't 'ancient'. I still have the info, and can pass this on if asked.