That would be good because I'm not likely to be able to create a whole MOD myself for a long time, I lack the knowledge in this area, however I can certainly help others with lists of equipment etc.
Its amazing who used what equipment during WW2, we often (thanks to the media) just think the Germans had all the best gear, in fact they made an effort to equip/train and supply their allies in the same way Britain and the US did.
I think the Spanish Me109 model would be a good start for making Romanian/Hungarian/Finnish Bf109's, you could either use the version with no markings or add markings. Romanian Bf109's used the yellow cross of "Micheal the brave" in place of the German crosses (later they used a red/yellow/blue roundel), Hungary used a white cross on a black square + red/white/green Hungarian flag on the tail fins, the Fins used a blue swastika on a white circle and later a blue/white/blue roundel.
The Romanian Ms406 would carry the same markings as the Bf109 for the Romanian/Finnish air forces while the Hungarian CR42 would (I assume) have the Hungarian cross and red/white/green tail.
I also think that if we want a third class of fighter jets should be scrapped as even in the early 1950's they were still used alongside piston engined aircraft like the P51, my advice for replacements for jets would be (all have models available in the unit thread):
F4U Corsair, used by USA, France and Canada
Hawker Tempest, used by UK and India
LaFn7, used by USSR from WW2 into the 1950's, also used by Korea and I think the Chinese Communists used it too.
For Asia:
Thailand should get the A6M Zero as its advanced fighter as Japan supplied this and the similar Nakajima Ki43 to Thai dictator Pibulsongaram. The rest of Thailands military was pretty basic from what I know, they were tough jungle fighters by trade.
Philipenes should get the P51 as its advanced fighter and maybe the M2 light tank, the rest of their gear would be standard stuff.
The Hawk75 is actually another name for the Curtis P36, there is a model of this available in USA, French and Finish colours, could someone make a skin of the P36 in Nationalist Chinese colours?
I think India should have its own faction in the Asia/Pacific campaign, the British run Indian army and air force were actually seperate to the British army in the same way as the Canadians and Australians. Lord Mountbatton was effectively the ruler of India and Burma, his title was Viceroy, he was also overall commander of all allied forces in the Asian threatre, fullfilling the same role as General Eisenhower did in Europe.
The Indian army used a lot of "second rate" equipment withdrawn from Europe/north Africa, due to the nature of the Japanese army and the terrain the Indian army's the M3 Stuart's and M3 Lee's, the heaviest tank they used was the Churchill, designed to cross a WW1 style battlefield it was perfect for crossing rough terrain.
India would get Indian Infantry (the Commonwealth style units with turbans available would be perfect), the M2 light tank (tank), M4 Sherman (light tank), Churchill Mk VII (heavy tank), the Hurricane (early fighter), Spitfire (improved fighter) and Hawker Tempest (instead of jet fighter)
USA should have the Dauntless or Helldiver instead of the B18 Bolo as their early bomber as the model used for the Bolo is some generic Polish bomber.
USSR needs the I 16 fighter model instead of the CR42 used to represent the I 153 Chaika.
Germany should retain the Me262 jet fighter but it should not "replace" the FW190 and BF109, I think that all classes of aircraft for all nations should be producable even after newr aircraft are developed and the newer aircraft should be a lot more expensive to justify building the "cheeper option". This also keeps with history as for example, the BF109 and FW190 were both in production at the same time, the BF109 being better suited to low altitude combat and the FW190 being better at high altitude.
As a side note on German equipment, the Russians were not impressed with the FW190, it may have been powerful at high altitudes but it was seen as an easy target during the typical low altitude combat of the eastern front. In contrast to western allied fighter pilots the Russian pilots were actually more concerned about the nimble Bf109!
On tanks, the Russians liked the Panthers firepower and armour, but hated its unreliability and high maintainance, they formed a unit of captured Panthers and used them until the end of the war. The Tiger was also unreliable but its massive firepower gave the Russian tank crews something to worry about, they exploited the T34's superior mobilty to outflank Tigers and hit them from the side. When the Konigs Tiger apeared the captured a few of them (due to breakdowns...) and tested the IS2's 122mm gun against them, not only were they surprized by how easily the IS2's shells punched through the King Tigers armour (Germany was short of quality alloys by this stage) they were also baffled as why the Germans had replaced the Tiger with a huge pile of scrap metal lol.
I believe the USSR should get the IS2 as its heavy tank because the KV was by no means an "upgrade" to the T34, same gun, less mobility and slower production rate.
I also strongly believe the Modern Armour unit is pointless in this game, its an M1 Abrams, its looks absoloutely wrong for the late 1940's! The Modern Artillery for the Allied nation should the "Priest" self propelled gun from Varietas Delectat and the tank destroyer ought to be the M10 but no model exists to my knowledge.
The Axis tank destroyer would be a later version of the StugIII, the model used is a StugIII ausfB, an AusfG would be great.
For Italy the P26/40 was not a great tank, it never even saw action, the Semovente 75 is a beautiful attempt by the Italians to make something like a StugIII using the M13/40 chassis and it worked! The Semovente used a 75mm gun of similar capability of the US M3 75mm gun used in the M4 Sherman, it was capable of knocking out Allied medium tanks at normal combat ranges.
I hope the info is useful lol.