It was the design of Ing. Rossi, chief of the Technical Office of the S.A.I. in Passignano (at the Trasimeno lake), for a "full metal" fighter that was to be named
S.A.I. Ambrosini 404
(from the project: "
VELIVOLO S.A.I. AMBROSINI 404")
Even though interesting characteristics were evident from the papers, the aircraft was never built.
I hereby declare that the current challenge is technically won by
Mel 
,
who has control!
(Tomorrow evening I will be off for an eight days vacancy to my Trasimeno lake :-))
Good continuation to all,
Paolo