The aim of the More Affordable Small Aircraft Manufacturing (SAT AM) project was to develop technologies enabling the manufacture of lighter and more cost effective aircraft airframe structures, supporting the modernization of airframe production. This paper presents the methodology and results of applying Additive Manufacturing (AM) technologies to produce components for a cabin demonstrator. The benefits of the applied technology—including materials, tools, testing procedures, and design methodology—are discussed, and the results are analyzed to highlight the project’s impact on the implementation of AM and its potential significance for future aircraft manufacturing.