But like many declaration of "Il Dulce", it was mostly hot air. Despite the herculean efforts of rationalization and simplification, the MCIV 772 (Macchi Castoldi Idro-Volante/Hydro-Plane), as it was officially known administratively, was problematic to produce. To cope with the limitation of the Italian line-engine, Macchi had effectively taped two engine together and that obviously meant producing two engines for a single plane. Worst, Fiat had to create a new assembly line for the Macchi-modified AS5 engine and produce twice the usual amounts to power a single plane. The Italian militaro-industrial complex was simply unable to cope with such heavy demand. But with Mussolini's weight behind it and an unusual close collaboration between Macchi and Fiat, 200 MCIV 772 and necessary spare parts complement would nonetheless be produced.
Not only that, but Macchi also proposed a training version with a single engine and single propeller, this considerably simplified production time and 50 MCA 773 (Macchi Castoldi Allenamento/Trainning) be produced too.