I use Armageddon and, yeah, the game crashes if you try to take another province. However, it seems set up really well and runs really fast (thank goodness) and I don't have any problem with ships building quickly; it adds them as an element for every nation with a coastline.
I do have some suggestions for the techteams:
For infantry, add mechanics and get rid of chemistry. For strategy, add a guy who can do any doctrinal path, not just one or the other. You could set it up so that Human Wave and Grand Battle Plan research faster since they are worse that Spearhead for most nations. I'd also opt for an increase in techteam skill up to 5, at least.
I'd also add an event for each nation at initialization that let's them choose Market Liberal/Stalinist/National Socialist. If they choose Market Liberal, they get full Free Market to make up for their penalty for war declarations.
I would strongly suggest making the move to Armageddon for future releases; it's the future of the game, after all! And nations will make alliances under it's new Armageddon AI, I believe.
This seems like it has A LOT of potential, and I installed a whole new copy of Doomsday: Armageddon just to play it.