Fablab said:
Some time ago, a friend of mine said to me that in this circuit there are many capacitors with inusual (and difficult to find) values
Although it is not clearly stated on the schemo, most of the caps are combinations of two separate caps; as an example, the 2.06uF is the combo of a 1.5uF and a 0.56uF.
and the inductors are different from the ones around for other projects
That is a standard paradigm of using real inductors in audio projects: you have to have them purpose-built. You may experiment with off-the-shelf inductors, but in the end, you'll need to have them built for you (Sowter are good at this) or it's a good opportunity to DIY them, which is not difficult at all. You have to familiarise yourself with the available ferrite cores and the relevant calculations (nr of turns and gauge). Then you need some patience if you wind them by hand.