No doubt there are highly skilled engineers there, but saying "those" might be a stretch. It is possible someone there has worked on an SR-71A, but it last flew 27 years ago. It was originally introduced 60 years ago. A lot of the knowledge about this plane has most likely unfortunately passed on. That isn't to say people can't learn, but it is a tougher starting point. Honestly, almost like starting over I would guess.