Just finished reading Adrian Martin's Once Upon A Time In America.
In the meantime I've ordered a copy of Oreste De Fornari's book from a bookseller in Italy - I hope it's in English.
Just sent a Email to Robert on his website, so he can answer this question.Also, I ask of his memories on working with Leone on Genius.He is a down to earth guy and should answer.I asked that he posts here.