@Stahlwolf
The issue in detail is this--In the vanilla HOI2 Doomsday/DDA all technologies from about 1950-65 are lumped together as "1951 technology" I differentiate in my mod. I've for a long time added one transport. I've decided TWO levels are more appropriate.
Since I'm dropping the turbojet/turboprop requirement for level 4 the Dornier is a more than adequate replacement and even though built as a flying boat to resupply submarines at sea, it seems to me the most logical choice and has the load carrying capacity and great range.
Level 5 is USA C-130 Hercules or Amtonov An-12. The C-130 had a just slightly higher load capacity but the Antonov had greater airspeed. Both were turboprops. I've refined the requirements for level 5 to
Speed 550 km/hr
range 2000 km
about 20000-30000 kg carrying capacity (not in the game stats but in real life)
Turboprop or turbojet (usually turboprop)
The Junkers model would not fit specs for level 5. The Transall is a weak candidate for #5 but a candidate nonetheless. It would also require bumping the French plane to #5 and finding a replacement for level 4 for France. The Transall is just a tad light on the load and range (16000 kg/1850 km--actually the wiki is not specific if this is a round trip or one way range and I have a sneaky feeling that it's a one way range meaning a combat radius of only 925 km.), but will use if no better alternative is available.
Level 6 (new level)
USA- C-5 Galaxy USSR Antonov An-22 Cock Germany--military conversion of A-300 Airbus or copy of Antonov An-22 (used turboprop which was originally derived from a Junkers designed engine)
Speed 750 km/hr
Range 3000-3500 km (haven't decided which yet)
larger carrying capacity than level 5
As for French-German (or Vichy-German) cooperation think that would be entirely possible, but supersonic planes, intercontinental bombers and the like would have been excluded. I base that on two sources. One is Albert Speer's book
Inside the Third Reich in which he details his own efforts to increase Franco-German cooperation. For Speer it meant having the French concentrate on making consumer goods for Germany like shoes. The second source I unfortunately cannot pin down but it was some chance clipping I encountered from some aviation magazine describing the aviation industry in Vichy France. It described the CIVILIAN air industry as being alive and well and Breguet was one of the companies mentioned. As long as the application involved a MILITARY conversion of a CIVILIAN air project I see nothing wrong with hypothesizing a similar project. But I WILL change the manufacturer. The German company in the consortium was Messerschmitt, so it would be MESSERSCHMITT C-160. Maybe if Messerschmitt was building the plane to RLM specifications they'd insist on more range and payload capacity than a Germany only worried about ferrying troops around West Germany for self-defense.
I looked over the nexusboard and luft 46 sites and believe the Junkers EF100 to be the most suitable candidate but it would require the substitution of turboprops to meet specs
Likely end result
Model 4 Dornier P.192
Model 5 Junkers EF-100T (Turbopropellermaschine)
EDIT
Junkers turboprop with contra-rotating propellers ultimately improved for Soviet aircraft
Possible appearance of level 5 German air transport below (Tupolev TU-114 passenger airliner)
Possible appearance of German model 6 (Antonov AN-22)
@Keioel In Fatherland BOTH Chinas claim the whole area and the agreement (if it occurs) is to partition China. Only at that point are the cores given up. If EITHER SIDE refuses the plan then the war is prepared. If I was playing Nationalist China 36 GC I'd go with Grand Battle Japanese doctrine and in the postwar likely would opt for Modern Infantry. But historically they went with Soviet human wave and you're stuck with that choice. The question is whether as a human player you can pull out a victory in the war with EOC or whether I should weaken EOC a bit. The other choice is to program the Soviet AI to try to take advantage of the situation.
@shogun144
What version of HOI2 are you using? My mod requires Arma 1.2 or 1.3 beta 2 and as of 0.29 will require Arma 1.3 beta 2, which as far as I know will be the final version of the executable.