The only structural modification would be the use of a slightly thicker plywood skin on the wing which would bring the maximum permissible diving speed up to 340 m.p.h. Mr. Frati of course already has the Palas-powered Caproni F.5 design to his credit.
Since the Airone has no pressure cabin it would probably cruise at 13,000ft to 16,400ft using one engine only. With a pressurized cabin it would of course be faster and more economical to cruise at higher altitudes.
Source : Flight 13 July 1956