Gentlemen,
a fine initiative that I only just caught up with.
I had made my own "mini-mod" trying to enhance the Greek experience.
From what I have seen, the work already done on events, resources, industry and geography far surpasses mine.
You may want, however, to have a look at military leaders and, also, the tech teams, both organisations and individuals. On the organisations I think you are already doing well, maybe with a couple of additions possible, e.g. agricultural uni of Athens which, research suggests, did a lot of theoretical work on its field of expertise, or OTE/DEH for post '49 and '50. NTUA is certainly a good addition as is the Kapodistrian for a more "pure" science approach. Something to note is that resources should be modelled for their potential, not just how they were actually used. There were also some individuals, especially in the military, that did a LOT of theoretical or applied work in line of the development of doctrines. Their contribution fell, to a great extent, victim of post war Greece which has snubbed, in terms of publicity, such individuals (and the infrastructure work in pre-war Greece) mostly for political reasons. A key example is Konstantinos Dabakis (many field manuals, books etc are seminal). There were also others who did development work in practice (Iatrides for basic submariner tactics, Tsigantes who build special forces in Greece - to a great extent going hand-in-hand with the development the brits were doing in the Middle East).
There have also been some good points about how the basic game engine does not model the "purchase" model that many minors followed for their first armour and aircraft units. One of the big mods modelled this properly in the tech tree (I fail to remember which one it was...)
Finally, about armour. I am unsure about wether any of the nations in the area can claim an "armour division" of any sort. An armour division, in game terms, is more than the collection of the equipment (and even that is a stretch, historically). Without expanding on this, I am also of the opinion that, at best, the existing resources up to about '41 should be modelled as brigades.
Keep up the good work!!
PS: I can mail the relevant files to anyone who is interested