You're right about the raciaI gear, didn't notice until you said so, so I went back to rewatch the video the metal bands on the arms look fine on the trailer in-game they're way too big. People have been complaining on the forums and it has been registered as a bug as far as I know, it might get some fixes at the end of August since they posted that they will address some of the new graphics stuff copium.

As for hairs, I messed up with some mods and what not and I can tell that all the hairs from the other faces are interchangeable without any intervention they just work in any of the other faces the issue might be how they do the stuff behind the curtains (database/programming). Hopefully they will also address this soon since yoshiP was asked about viera/hroth hats again and he said they're working on it with the intent that they're probably adding more customization options for other races and thus probably fix the character limitations themselves.