The Piaggio P.119 was a cantilever monoplane, constructed completely of metal, with a conventional wide undercarriage. It had a forward-mounted cockpit, with the weapons mounted just behind the three-blade propeller. Air intakes for cooling were fitted under the nose. It had advanced construction for the time, with many removable panels for internal inspection. The number of components were reduced to a minimum, and also standardized, to make construction as easy as possible. No other Italian aircraft was so advanced in these details.