BrewLAN is a mod for Supreme Commander: Forged Alliance that has been in on and off development by a team of one for almost a decade. It adds a wide variety of new units for all factions, as well as offering several new game modes and features. The core design goals for the mod are simple; to add new, interesting, and visually aesthetic units which complement those already in existence and to maximise technical compatibility with other mods.
So an upgrade for Aeon T3 Mass Extractor?
Yes.
Does this mean each T3 extractor is getting a special upgrade?.
Each race is getting an upgrade to each of its T3 economy buildings. Aeon are getting shielded things, Cybran cloakable things, UEF engineering things, and Seraphim armored things.
The only one of questionable use is the Cloakable Mass Extractor, but I can see some fringe cases with keeping control of MEX points in a battle zone.
you also have a strong case of "ninja-mexing". after all, an omni is required to spot them...
if you're still open for ideas for Cybran mex upgrade, how about an EMP point defense? no dmg, just stun. i noticed that Cybran uses more EMP than the other factions, so it could be another option instead of cloacking.