Pic Sport-Auto, 1975. View attachment 2495414 [/QUOTE] Picture shows via Toscanini 90 in Modena. Sport Auto is still there with the sons of Aldo Silingardi sen. and Gianni Diena sen. They came from Ferrari and worked from 1963-66 at Automobili Serenissima/Sasamotors (and Garage Camellini) in Via Malmusi (down town Modena just around the corner of Assitenza Clienti). After 1966 they formed Sport Auto and moved to the former premises of Carrozzeria Gransport in via Toscanini, where - among many other projects - the Cobra Daytonas' and the first two Serenissimas' bodies were made. 1974-80 they were commissioned by the factory to build several Ferrari 312P(B) from left over parts and restore F1 cars. And serious rumor goes that Gianni Diena was an illegitimate son of Enzo Ferrari. However, they were well connected to Ferrari and the works. About building chassis and P4 drawings I have no information.