I'd rather look at the Foreign Military Studies series of documents than those wartime intelligence briefs, which were ridden with mistakes.

For example, Hitler did not solve the problem how to create an officer corps for a 300 division force; even counting Luftwaffe divisions, there were only about half that many, and army officers were always short in supply.
A 300 division force with a (normal) divisional slice of 50k personnel would have been a force of 15 million men; it would have required French- or Soviet-style mobilization to come even close!

Another example is the SA, which became quite irrelevant in 1934 and was certainly not the kind of important organisation in 39/40 as described in that 1942 document.