I always thought that it's just a representation of symbiont armor modified using EI's own biotechnology...
Never seen pre-N3 rules, but indeed - nowdays there's a specific clause on the list of exceptions: "Units possessing more than one Troop Profile whose cumulative Wounds Attribute is greater than one (for example, units with Transmutation)."
From the 2nd edition rules: http://infinitythewiki.com/en/index.php?title=Viral_Special_Ammunition&oldid=1834 As a collateral effect, this Special Ammunition prevents biological beings using the Transmutation Special Skill for the rest of the battle once they are wounded.
You can reposition the Fraacta's jump pack without risking it breaking (nor cutting it for repositioning, as it looks in the photo) so the "feathers" surround the model and it looks like touching down, specially with the BSG model (it also has the advantage of not using so much space! Great for transport).
Here is another easy one: Take the Tohaa pilot and just cut the arm at the elboy, turn it around. Put the flight module and the Fractaa Hacker is ready. Gesendet von iPhone mit Tapatalk
This is my understanding as well. No longer fire sensitive, and provides extra survivability once damaged.