Increased Japanese Production

I was just watching a series on 'The Pacific Dragons'(Japan, Korea, Taiwan, Singapore). It mentions the 'miracle' that took place in post-war Japan first. It claims that by 1948 Japan had surpassed British ship-yard work including start to finish ships on the largest order. That by 1951, surpassed the USA and Britain combined.

It attributed this economic miracle to an unique combination of that culture(also of Korea, Taiwan and Singapore) and 'modern prefabrication assembly line mass production technigues' introduced apparently by the Germans during the war. Till then like the British still the Roll-Royce vs Ford theory?

Now someone did prove to me that as early as the 1943 naval program, the Japanese, using these new methods, had started decreasing completion times while maintaining quality of Escort Destroyers from 6-12 months to 4-5 months. So obviously they were already on the right track.

Here's my question.

Is there any way to estimate how many more ships of any type the Japanese(remember this includes Korean and Taiwanese shipyards then), could have built and maintained over what they actually did historically, had they adopted the same methods that created their post-war ship-building miracle say starting in 1939?

Let's leave out other factors like imports and resources and stick only to the production level query please.
Assume they either don't go to war or they go back to learning from the Royal Navy and successfully secure their sea-lanes for the duration. Just stick to the application of the so-called miracle of post-war shipbuilding to pre-war instead.

If you can cite sources and data, please do so, and thanks.

*Ah, if I only knew then what I know now...i would've saved myself so much work and effort lol.