This demands to be done (and indeed I'm already working on acquiring the funds through painting projects)
Current thought process is:
-The list more or less would Hard counter normally annoying match-ups for Ret (basically the griefing engine list). Gators can't even begin to put a dent in it, p and eFeora would have some issues and eLylyth has to eat through all 64 hit boxes (and unless she does it in a turn Hyperion can heal 2D6 + 1D3 per turn) to get to pVyros. Mobility and running first turn would put both titans on objectives pretty easily too, so unless they want to sell their armies piecemeal to not lose to scenario it should attrition fine.
-It's also much akin to bringing Terminus, he's not so much a "good" caster as one that you could get blindsided by if you werent prepared and 128 hits points of ARM 19 awesome combined with hitting like a runaway truck is something you could easily suprise an opponent with.
-If you're wondering why pVyros, he's one of the few Ret casters that has a straight SPD buff, so it still works on Hyperion, he's got Bird's eye, so shutting the army down by throwing out clouds or hiding behind a forest doesn't work, but more importantly gaining focus every time you destroy a model would allow Hyperion to do signifigantly more damage than 3 focus. Even just the secondary shots firing D3 could all have boosted attack rolls because each hiti is netting you an additional focus and just having the arcanist giving it a focus to do a sweep power attack could give you enough kills to get Hyperion back up to full power. It also makes the Colossal difficult to disable, since a quick Repair by the Arcanist and a few kills from the feat gets all titans systems back and full focus.
Certainly not applicable for all situations, but more than a few of the "always bring this against Ret lists" would be blindsided and ground to paste which is the real appeal. Regardless, double Hyperion's is cool enough I'll probably do it even if the list flops, but I'm pretty sure when your caster is commanding a pair of doom robots with distentigration rays it's legally required to twirl your mustache and cakcle maniacally.