Well, this thread is going on 20 years old without any new posts, what a shame. I haven't been active on this site for the past 7 years either, until now, but was checking in to research an Ernemann Ermanox and decided to look around again. In the passing years I have done a lot of research on, and purchased over the years, a lot of Ducati Sogno cameras, lenses and accessories leading to a substantial collection. It has become a passion of mine. Its not just a camera, it is a complete 'system' with fantastic (but alas, expensive) lenses and accessories for almost any photographic endeavor.
In the early days it was a struggle to find much in the way of definitive information about this beautiful example of craftsmanship, especially in English. In the end I worked through the information in Italian (with the help of the early Google Translator) and later met and collaborated with the kind owner of the 
BenciniStory website. He is a premier researcher of Italian cameras and thankfully was willing to share his research with me of the Ducati Sogno. The result was a complete translation of his Sogno research to my 
website and later, a joint effort to produce an English translation of the "
Normaili", that is, the way to use the Ducati camera and accessories in normal use, in book form.
For anybody interested, please feel free to contact by PM here, or at my website. The Sogno is a camera worth owning and the workmanship Ducati put into them insures that they will be around for many decades to come. Below are a few from my collection:


