I hope things go well on that front as well. Now I see why Exrah hold a special place in your memory. They were your first & by my guess only Infinity army. So the want to run an RPG campaign using them in it does make a lot of sense.
Not the first one, had a JSA Small Army to "learn the ropes" (3 boxes = 4 Biker Aragotos supported by an Oniwaban, a Domaru and 3 Keisotsus). . . But the Combined Army Exrahs were those into which I invested a lot, after "Proxy Learning" all tricks-of-the-trade; in my LGS no one played CA so I wanted to give some new interest, but it went all awry. . .
Golem suggested (quite wisely, I daresay. . .) to shape the "Surturans Xenomerc Force" around extant Merc Companies with the most generic Trooper possible. . . As it will be an "Exrah Rogue Faction", a "Splinter Cell" of the Concordat that decided, upon crashlanding their Carrier on Svarhalheima, to go "Full Native" and start working for the rivaling human Factions of that frozen "Snowball Hellhole" of a mining planet (Pan-Oceanian "Vikings" are the majority % of the population, competing with hardy Yujingese "Blue Mountain" Colonists, but in the Contested Borderlands there are "Secessionists backed by Criminal Submondo Cartels" like the Druzes shown in the Outrage Comic). . . Probably will "Shape" new Exrah Specialists (bred in the Technorganic Womb-Ovopositor of the Exrah Hive Queen directing the Mercs) that will be "Biomech Insectoids" reminiscing of Brawlers, Wardrivers and Bounty Hunters. . . Of "Corpsecurity / Bounty Hunters / CSI" will elaborate especially the Heavy Armoured One, but rather being a Powersuited HI wearing sleeveless trenchcoat, will be an "Ephemerah" encased in a Cybernetic Chitin Exoskeleton optimized against Cold Climates. . . Also "Yuan Yuan" boss stats (the limited edition minis; Yuan Boss "Yellowsea Pirate Captain" with ponytail, portuguese beard, big CCW sword, Heavy Armour and Jetpack Wings) could be some sort of "Iskaller Winged Bugman". . . . . Thesr considerations are JUST to ease frame-of-reference for whom play ONLY the Wargame; as previously said the Fanfictions that I inted to write exists as "Narrative Background" for My RPG Campaign. . . Whatever is "Wargame O.K." but not useful for "ITGRPG" purposes will be countermanded, even if contradict N4 Rules (that I frankly, could NOT care less for). . . . .!!!
At the moment the Fiction that I'm elaborating as "Gameworld Background" will left a little aside the "Exrah Reborn" but concentrate a little more on their allied "Former Combined Troopers Turned Xenomercs Company". . . Essentially the "Biomech Spidertank Titanbot" will execute a "Circuit Tour" of "Secured Locations" where some Xenomercs Auxilia has taken roots as "Protectors" of a Contested Borderland Shantytown (or very insulated, but extra-cozy "Green Island Amidst Icehell", that somehow evaded the two competing Hyperpowers attention). . . Some of these "Resupply Depot Frontier Villages" will be High% Human "Clients" places with just a "Token Presence" of Xenomercs; other will be instead "Alien Refugees Communities" where ONE (or more, rarely) Former Combined Race has started to develop their own "Social Ecosystem Niches". . . . .