Schacht might have been a brilliant state accountant, but what he and Nazi germany mostly did was taking a massive but hidden debt ... where the idea was to repay it with war treasure - which failed.
I'm not so sure about the "hidden debt" story. I have a feeling that that's a story popularized by people who want to believe that everything done under the Nazi regime was bad. The truth is that the rise of authoritarian extremism tends to be facilitated by economic uncertainty (yes, racism and xenophobia tends to play a big role as well, but immigration is always easier to stomach when jobs are plenty etc.). Stavin…
I certainly do not have a problem with learning from Nazis when they did things right. I just mostly learn from them how not to do it. Regarding this example see the other reply. They invested mainly in military - which only can pay off with a succesful war.
Another important example of "how not to do it, I took from "Mein Kampf" where Hitler states how he became Antisemitic. Basically he says his instinct and feelings were allways disgusted with antisemitism, but his rational thinking convinced him more and more to the point where he made the conscious decision of being a mortal enemy to the jews. (and after that he said his intuition which he could rely on usually ... went away for a few years)
So my takeaway is, to trust more my instincts and feelings which I take for deeper thinking, and not the simple, rational thinking which is too shallow for complex things.