Similar to the ship designer system introduced in the game’s Man the Guns DLC, the new tank designer system will allow you to select a chassis type and outfit it with several different modules, dictating and improving the combat capabilities of your tanks. Hearts of Iron 4’s upcoming, yet-to-be-named DLC, and its accompanying free 1.11 Barbarossa update, will introduce a tank designer system, letting you customise the chassis, main weapons, engines, and other modules of your armoured units, developer Paradox Interactive revealed in a dev diary earlier today.