It’s going to take more than a few parts and some sections of metal to duplicate stealth tech. If it was that easy, China wouldn’t need to steal it. Just look at their recently revealed ‘stealth’ fighter. It has elements that looks a lot like our F22 Raptor, but it’s pretty much just looks, they dont have the thrust vectoring tech. BTW, this ‘revelation’ of a stealth helicopter is not a revelation. We’ve had a stealth attach helicopter for years called the Comanche. The only revelation is that we apparently have a ‘stealth transport’ helicopter now.
I remember when an F-117 stealth fighter broke up and crashed in a suburban neighborhood near Balto. MD during an air show. The military blocked off the neighborhood until every bit of the plane had been removed.