[PvK]

Might want to look at Proportions mod for a starting point, too. Version 2.x and version 3.x have slightly different values for the troops.

I do use the attack and defense modifiers, figuring that "combined arms" principles can explain why an entire army is more difficult to damage if it has a mix of things with different bonuses. E.g., tanks are less easy to bazooka when they are screened by infantry, and vice versa.

PvK