It seems that our freind has been cutting and pasting straight off of Google here, I have just done a search and found a similar paper.
It also seems he has become an instant expert of such things, have you ever heard the saying, a little bit of knowledge can be very dangerous, I know of a man from Yorkshire who thinks he is a pipe maker, but that's an entirely different story.
As PJ and Tom have said, it is impossible to convert metal to timber readings of any standing wave form, metal has no absorbancy properties like that of timber, so the two cannot be extrapolated.
On the subject of copying a beautiful sounding instrument, this is entirely possible and in any pitch of your choosing, there is an extrapolation theory, where your faviorite instrument can be made to the pitch above or below it, this does work as the many who have used it will tell you, if there are any who might be further interested in this, please PM me.
We can all bang on about rushing until the end of time and never learn anything, my experience is this, if anyone has to use a rush in order of getting things into tune then the instrument is not made correctly, you are simply building an instrument to fit the tuning aid, when it should be the other way round, deleating the object in question, this has been done by several top players now on numerous occasions, less is more.
I have also just recieved knowledge about one of our top reed makers, who tuned an instrument from someone, by one of Europes top makers, he managed to do this by elliminating the rush altogether, only to find out that the owner, who then sent the instrument back to the maker, who then immediately refitted it, this tells us, that some have the knowledge to make things work on their own and some don't.
If you like a challenge buy an instrument with a rush fitted, but don't go screaming to your maker when things go pear shaped, have a go at making a reed for them and then post your comments.
Train to be a pipe maker today, help those who want to help themselves.