Dagger Tower
Description:
The Dagger Bunker is the anti-air upgrade for the Component Tower. Instead of having a real turret like the other 2 upgrades, it changes the Component Tower into a miniature missile silo, armed with 4 SAM’s (Surface-to-Air-Missile). These missile are very effective, and can take down most air units with a few hits. It can’t fire its missiles on ground targets, so be sure to have some Guardians and Hellfire Turrets around too.
Renders:

Note: model and texture may change at any point during development.
Non-official comment: I wanted the AA turret to be a bit like a Bunker, so I decided that hiding the missile bays in the Tower itself was a nice idea.