Thanks yet again. I suspect De Jong was probably correct about the 3.7cm AA guns not being delivered, although I can found no other information on the order at all. I will have to keep fishing for more information on the 3.7cm Pak delivered.
By the way, I am indeed familiar with the 1939 Program battlecruisers. I have several back issues of Warship International that trace the pre-WW1 and pre-WW2 efforts to acquire modern capital ships.