I was in the same boat with AA50 and perhaps this might help. Here’s a post that I posted on fieldmarshalgames.com forum site.
“Here is a folding game/poker table that I built for Axis & Allies. Quite a few hours and dollars to put together and it being my first table, I think it turned out pretty good! Now I don’t have AA50 but I did, with time and effort, make my own version. The map was printed to 28x48” (map was created by Imperious Leader that I downloaded from Gameboardgeek.com) and I even went as far to make the combat board, National production/research chart and the nation cards. I repainted the pieces so they match because I don’t have AA50 and had to mix pieces together to replicate it. I must say it turned out well and it was a lot of fun!"
Here is the link to the post as well for more pics.
Here is the link for the AA50 manual.
As far as I can tell it’s difficult for them to get the rights to get the games. Only so many for extended periods of time. Thus I doubt G40 or 42.2 will be added for a while since they are still being sold OOB.