I found info about the A118 compound helicopter project (circa 1960) in a book (in Italian) on history of Italian contributions to mechanical engineering, with an interesting chapter devoted to helicopters. Further material, including the real blueprints, should be available at the museum of Agusta, right outside the main historical plant at Cascina Costa di Samarate (VA), Italy, in what used to be count Agusta's villa. It presents substantial similarities with the Kamov Ka-22 Vintokryl, which flew at about the same time, and had comparable size.