I can build the arm, but you might want to see Add for more accurate calibrations. My medical knowledge is available, but it isn't quite as extensive as his. That said, he's adept with robotics, so I'm sure he could build you one as well.

[They're almost done now. Gnosis is on the last stretch of those cracks, steadily dripping that melted metal into it. Once they're at the end, he sits back and sets the utensils he's holding aside, only to grab Vash's arm and give it a good, thorough once-over just to make sure he didn't miss anything. The silver mixed in with that blue looks almost pretty to him, even though it certainly isn't hiding the damage that occurred.]

There. It's more of an art piece now, but it should be reinforced for the time being.