I checked the Nexus and didn't see a Big O power armor mod. Also if it was possible to make BIG O's pile bunker fists actually work in melee. Another idea is if someone did Roger Smith's hairstyle and suit for the male character, maybe Dorothy Wayneright for the female to. Could also turn codsworth into a synth or just a butler suit of Norman Burg. They even made toys you could use for 3d model.
Just and idea that would be sweet.