ASSEMBLY FOR A GAS TURBINE ENGINE AND MANUFACTURING METHOD

An assembly is provided for a gas turbine engine (20). This gas turbine engine (20) assembly includes a stationary engine structure (34). The stationary engine structure (34) includes a diffuser (60), a combustor (50), an engine case (112) and a plenum (58). The combustor (50) is disposed within the plenum (58). The engine case (112) forms a peripheral boundary of the plenum (58). A gas path (40) extends sequentially through the diffuser (60), the plenum (58) and the combustor (50). A first section (121) of the stationary engine structure (34) is formed as a first monolithic body. The first section (121) includes the diffuser (60) and the combustor (50). A second section (122) of the stationary structure is formed as a second monolithic body. The second section (122) is configured as or otherwise includes the engine case (112).