Piaggio P.133

The Piaggio P.133 was a development of the P.108 which its first prototype was almost complete by the Italian armistice on 8th September 1943.
It was a single-wing monoplane made entirely out of metal in alliminium alloy with a very high horizontal fletching and double rudder.
It had a conventional retractable mechanical landing gear which, when retracted it went back to the nacelles together with the tail one which retracted into the middle fuselage.
Flaps were placed in the middle, front and backward of the wings together with the ailerons.
The design was heavily influenced by a captured B-24 Liberator and had therefore a very heavy defensive configuration. It was, indeed armed with 4 frontal 12,7 Breda-SAFAT machine guns, two of them aiming to each side of the frontal part of the fuselage, manned probably by the navigator, two 20mm Ikaria MG-FF (manufactured in Germany) placed in two dorsal turrets, another two placed one in each side. Both ventral and tail positions were armed with two 20mm MG.151 each, however we considered that the tail section would've been probably upgraded to hold four MG.151 just like the Avro Lancaster. It had a payload of 4800Kg (10600lb) of bombs.
It was going to be powered by four Piaggio P.XV radial engines delivering each of them 1700hp of power which we took the liberty of borrowing them from the Breda BZ.303 as they look more 'Italianised' than the 'standard' drawing that was running around the internet.
Overall, it looked like a big step forward on Italian bombers, specially considering the defensive armament configuration and there are little doubts that, if it had been produced, it would've been an excellent bomber.
Work on the first prototype was started on 1st June 1943 after a captured B-24 was taken to Guidonia (the Italian Regia Aeronautica's test centre) where it was deeply examined. Six heavy bombers were ordered, and production started in July. However when just the wings and fuselage were complete, the project was cancelled due to the Italian armistice.

Sources:
1. https://en.wikipedia.org/wiki/Piaggio_P.108#P.133
2. https://forum.warthunder.com/index.php?/topic/366680-piaggio-p133/
3. https://forum.warthunder.com/index.php?/topic/265595-p133-heavy-bomber-prototype/