Athena should be a transport for one unit, a radar station, a short range ultrasonic station, etc.
Ultrasonic stations should make cloaked units visible, but are very short ranged.
Radar costs only 55m, so why not include it in a unit?
If it could transport units and cloak, it would not require so much build power.
If it could stay cloaked while it drops the transported unit, it would be very different from Valkyrie - >1000m units are too heavy for it.
As a transport it could enhance the other facs usefulness.
BTW: why can you not cloak a cloaky fac? why does the shield fac not have a shield or the tank fac not have a peewee weapon like Welder? Why can the jump fac not jump and the (smaller) spider fac not be build on a step cliff? Why can the ship fac not be submerged on demand? Why can the hover fac not hover like the BA hover fac? How about hovering defenses? XD