Ezto. Like your idea. Just have to ask…
If UK/US is landing in Western as you take Caucuses, what are you going to do next?
With your build sequence, your entire German wad is in Caucuses, except for minimal defensive forces in Germany (and even less in Southern). Mid-Europe is EMPTY, allowing Allies to walk in and make themselves comfortable for little to no loss.
Also, if UK is in Western, then their fleet is within reach of Germany for a double hit of Western forces plus Amphib forces.
And all you gained is Caucuses, a 4 IPC factory adjacent to Russia.
Admittedly, it is a HELL of a gain, a worthy prize, but to not get it until G4 after UK and US are already all over France?
You might want to play test this one a few times to see how well it works out. Also, you made no provisions for a Russian counter-attack either at the advancing forces, or to block them in Ukraine and/or Caucuses. Remember, by G4, Russia has built an additional 30 some odd INF too…