Since I do not have a speaker system in my helmet yet (so many projects, so little money), I may really shooting myself in the foot, but...
Might it be appropriate to make a speaker system a criteria for Mark Standards?
Granted, stormtroopers are not supposed to be too chatty, but without speakers, we're mimes. The Mark Standards focus primarily on the visual aspects of accurate armour, but perhaps they could be used to raise the bar (again) towards fully and accurately animated stormtroopers.