I would love to play a game of it, we could make it the center piece of the event and try to get everyone involved in it, though that would require us using the D6 rules as oppose to the D12 (highly doubt anyone has a problem with that?).
An interesting way to do that might be to declare a national commander, some one who is the over all commander for one nation but he appoints different people to command (move, and roll for) forces on various fronts. This way you could have people pass in and out of the game but still get a chance to play and not worry about overall strategy going screwy. For example, Gar wants to play as Germany and at some point he will have to fight on more then one front, so he appoints (asks) Vance to command forces on the western front while he commands forces on the eastern front (or vise versa), So Vance would keep track of all forces on the western front, make combat moves, non-combat moves, roll dice, and request reinforcements during the place units phase. Vance doesn’t need to know what Gar’s overall strategy and Gar is free to concentrate his efforts and attention on the eastern front. The added bonus is that if Vance wanted to check out another game and leave the 39 game he could do so and Gar could bring in someone else to command that front, if he so chooses. Then if Vance wanted to come back in but say Young Grasshopper has taken over his command spot, Vance could jump in as a front commander for another nation without giving an unfair advantage to that side.
So, we would have to declare National commanders for each major power (or grouping thereof, like the British commonwealth) and each national commander decides how many front commander spots he will have or need at any given time during the game, and we can rotate people in and out as needed, this way everyone who comes can get to play. Also, national commanders of the same alliance can decide strategy amongst themselves and so you would still have some coordination within the alliances.