What if instead of trashing the bunker building, the 1.0 bunker modules were replaced with completely different, more... uh... "modular" modules?
IE: instead of tunnel pieces and walls and stuff you got modules that were basically whole bunkers in themselves - not so much designed to connect to each other in the specific ways the old modules do, but to be placed in relation to each other in a loose way only.
Examples:
> Brain bunker that has two entrances and blast doors and isn't just a room for your brain to be in. Brains are mobile these days anyway which imo changes things.
> Craft landing module with sites for turret placements and barriers against horizontal fire
> Uni-directional watchtower/trench thing for area control specifically (so it's not tall because the focus is on controlling the area in front with machinegun fire, not being a wall)
image> Some pre-fab underground bunkers.
> Mining shaft
> Vehicle hangar
> Artillery
> There could be a bunch with a focus on serious subterranean fortifications, since that's what makes sense for very-entrenched defense in CC maps, where enemies come from three sides.
Mostly these would be either:
1. Half underground (most modules used for defensive troops - the central idea basically being trenches with concrete over top)
2. Fully underground (brain chamber, mining sites (?), armory...)
3. Fully above ground (sniper tower, low wall, whatever)
Let's face it, the terrain in CC isn't interesting or important enough right now for map-specific bunkers to be super necessary.
And tunnels are nice, but in CC defenses aren't reinforced from "the rear", because there is no rear - they're reinforced from space. That's important.