Luciano Marabese/ V11 Sport Designer
The creator has passed.
http://www.motociclismo.it/la-morte-di-luciano-marabese-morto-a-68-anni-il-designer-moto-guzzi-gilera-piaggio-66470
http://archivio.animaguzzista.com/maestri/marabese/marabese.htm
From the best translation, of the Anima Guzzista interview, to English I can see (using google Chrome):
Luciano Marabese: "I started to draw . . . the V11 from Gambalunghino . . ."