As far as I know, the emitter face should just be black (barring the nipple). There is some debate whether it was just black or if it were more closely painted to resemble the hero Obi hilt, I.E. - a dirty, gray color for the emitter, black on the grenade section, and dirty-brass on the neck.
Personally, I lean towards the latter, with some exception, and both the V2 and Stunt looked exactly the same at one point pre-sequels and made to look a lot like the hero saber. Again, that's just preference. As far as the black wire, a part of me feels that it's two wires wrapped in electrical tape, but that's just me.