There are a lot of subtle, computer-guided tools available today. If someone wanted to do the programming, in principle they could absolutely copy any existing instrument they could lay hands on. They could also, again at least in principle, create additional instruments that would fit in with the maker's existing oeuvre.
Could experts detect the fakery without using sophisticated chemical, dendro, or radiological tests?
If so, what would give the fakes away?
As devices for making music, how would they probably compare with hand-mades by the average successful maker, and why?