Yes it is.
It was a real nightmare to get the frame. It was possible with the help of Woodyuk
a RB member and 2 month after the biding. Thank you once again!
Boron fiber has been mainly replaced by carbon fiber. I am working in 3 possible sources for that small quantity of material. In any case it seems possible.
If somebody had a similar problem, his help and experience are welcoming.
At the end what I like is to put on the trails another good bike.
I agree with zetecmk2 what is important is to ride the bike, doesn't matter is NOS or not.
I will create a post when the project will start.