Hi Skyman, Lark, Skybolt and other friends,
delving in my ever out of order archives, I met the picture I think is the only known hardware really built of the Italian P.133 long range bomber.
Answering previous posts, evidently the headline of the article for "Aerei nella Storia" was an exaggeration: as Skybolt already said, headline makers (but also the model kit marketing directors) are looking for some effect in naming their subjects.
Notwhitstanding that, I had the occasion of have a look at the archives of Eng. Giovanni P. Casiraghi, technical director of Piaggio, and I saw he had a special file for pictures and documents about some aircraft of special interest. I saw a lot of photographs of the B-24, of the North American/Ryan Navion (of interest for the development of the P.149), of the Martin Mariner (in the same class of the P.155), of the AeroCommander (for the development of the P.166) etc.
Sure, the B-24 and the P.133 are quite different projects, but indeed for Regia Aeronautica the P.133, if built, would be something in the same ballpark of Liberator...
In fact, we have very scant information about the P.133 and is a matter of fact that during its development it was completely redesigned (apart for planform) in respect to P.108B and the early P.108bis concept.
We lack any accurate three-view drawing and also the artist's impression that appeared on the feature of "Aerei nella Storia" was largely an interpretation of the illustrator. Anyway, I still think the development of P.133 was at some extent influenced by other bombers of the time, as the Liberator and the Lancaster. As you can see in the enclosed drawing by late Giorgio Bignozzi, the section of the P.108B fuselage was circular from the wing trailing edge to the extreme tail and the fin and rudder was single. The wind tunnel model of P.133 sports a rectangular fuselage and twin fin and rudders (like the Liberator) and a nose very similar to the one of B-24D.
The enclosed picture of the fuselage section that appears on the book of Giancarlo Garello ("Il Piaggio P.108"), captioned as a section of the fuselage construction of P.108B, has flat sides and seems to be consistent with one of the first structural parts (perhaps the only) really built of the P.133 prototipe (serial number MM.26248) ordered when the project was cancelled by the German authorities, after the September 8, 1943, armistice.
Thank you for your interest in Italian projects
Nico