Little_Boot,
––If you want an longer A&A game with expanded unit types, new countries to play, and some additional land & sea zones I suggest you check out HBG’s Global Warfare 1939. It has been play tested for approximately two years and is quite balanced now.
––IMHO,…it is just what you have described. You can use the A&A units you already have and just add the new countries units and the new unit TYPES for the ‘standard’ countries.
----I have no doubt that HBG’s Global Warfare 1939 is to be the future of our A&A gaming experiences. They are already planning to release a 1934/36/39 version later this year(2014).
“Tall Paul”