Huh, I’m not sure how a module might have done that; there’s currently no mechanism that the game supports to manually adjust mech sizes. They might have snuck a formorian frame on one somehow, but iirc the NPC kit picker in the current build doesn’t let you pick PC kits. Possibly they manually edited some json files?
I can put this on the request list, but until then you might have to open those modules in the editors and figure out how they did it.