I know personally Prof. Luigi Pascale, the Partenavia and Tecnam founder and chief designer.
I could ask him something about PD-93.
Anyway I really dislike the definition of "Standard boring plane", is this boring only because it don't launch bombs or missiles, for its desing, because it is propellend by an "old" piston engine?
Aircrafts are aicrafts, and this Forum is devoted, at least I think, to less known or unknown projects, boring or not.
Furthermore I want to remember that Pascale designed one of the most beautiful twin engined plane: the vast family of P-68 (with the remarkeable Observer).