Some things I left out:
The huge volume of money flowing through IG Farben changed its internal distribution of power. The central corporate administration lost its control to young technicians with ever-increasing independence and responsibilities, and the latter could justify any decision by referring to Wehrmacht orders, though they themselves pushed the military towards what they wanted to do.
An example of the limitations of prewar raw materials rationing was that by 1938 Germany was full of half-finished building sites with idle men and machinery; they had their steel reassigned to others but just waited for a new ration.