Questionable if the Japanese had the industrial capacity to build a German tank even the Panzer III.
Very true. As it was, the Germans provided the means to build a licensed version of the Me-109, which became the Kawasaki Ki-61 fighter. It was so advanced in both concepts and required production quality (on top of an already overloaded Japanese industrial machine) that it was nothing but trouble for the Japanese until the last months of the war, by which time it made little difference.
I wonder if the Germans ever tried to provide the means for Japanese-made Panzerfausts....
Japan had the same problem the US did — tanks had to be transportable on standard gauge rail lines, and lifted aboard ships by available dockyard cranes. These limitations prevented the US Army from fielding a true heavy tank until spring 1945.