A modern day Nazi germany would have a military spread into two parts: the militia and the professionals
Militia would be all german males from 18-45 not in active military duty, and all former military personnel that settled the east as farmer-soldiers (Roman method).
Professional forces would be the Waffen SS, the Heer, the Luftwaffe and the Kriegsmarine. Of these, the SS would be the most powerful, in its intended political role and because the heer would get a lower priority than the SS.
Special forces would be under the SS.
Kriegsmarine would be a combination of an enormous Uboot fleet and a fleet in being of battleships and carriers.
More importantly would be the division of the new world order in Europe, which as far as I could discern would be centered around a Greater Germanic Federation (Low Countries, Denmark, Grossdeutschland, Switzerland, Sweden, Norway) in a larger european confederacy as Speer envisioned, led by the countries respective SS/ fascist parties. Partisans and guerillias would die down as it became clear that germany was there to stay.
Economic collapse would be nigh-impossible, because of the radically different method of economic organisation. Strategic bombing would be impractical because of the new city layout as Feder intended. (many smaller cities, decentralised industry).
Political collapse would be weird, as after the war, the SS would retake its place as the bringers of an new germanic state. After the death of hitler, the leader of the SS (either Himmler or someone else) would take control.