Gotta love Halo. =D
The mod works so I don't intend to update it, if anyone feels the need to expand upon it, feel free. I just used the Novalith Cannon for the model, didn't fool around too much with turning speed or the projectile. Also only made it for the TEC race heh.
Basically, in tier 5 you can research to gain access to the MAC (Mass Accelerator Cannon) Gun. It definitely helps out with defense. Does 200 damage with a cooldown of 8 secs. Costs 12 tactical points. Also the range is about 2.5x that of the Gauss cannon. If built at the edge of the planets build circle it will just fall short of enemies that jump in and it covers all the way to the planet.
Installation Instructions
-All you have to do is extract my folder to your mods folder. Your mods folder should be located here: C:\Documents and Settings\YourUserName\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\Mods
Download link: Rapidshare
http://rapidshare.com/files/97684689/Halo_MAC_Gun__by_Zelfster_.rar.html