[Fantomen]

There have been a number of experiments with mods that attempt to alter the game into firearms based combat, they have so far run into severe engine limitations, like those elmokki mentions. The most ambitious project is Dominions 3000, which is a kind of TC. But that is almost never played MP.

You might also consider the many warhammer nations, if played on the warhammer map, as a TC.

Anyways, I believe the engine isn't quite fit to make a ww2 mod. there are soo many ww2 games around anyway, so why make all that effort for another ww2 strategy game in a subpar engine? Will anyone play it over any of the dedicated ww2 tbs games out there? I wouldn't.

What works best for dom3 is replacing the content with content fit for a similar set of mechanics. So a LoTR TC would work fine for example, or a song of ice and fire TC, or a historically accurate bronze age TC (just remove magic and forging) and so on.