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• The MITICA (Megavolt ITER injector and concept Advancement) experiment, currently in the installation and commissioning phase at the neutral beam test facility in Padua-Italy, will be equipped with a beam source (BS) expected to generate a 40A negative ion beam to the energy of 1MeV (values for D). It is composed of an ion source to generate a h or d plasma and of a multiple-Aperture multiple-grid (MAMuG) accelerator [1] , where ions extracted are accelerated in five consecutive stages of 200 kV each. • The engineering and fabrication of the beam source for MITICA BS started in october 2018, when a contract between fusion for energy (F4E) and alsymex (France) was signed. Presently, all the components and sub-assemblies have been manufactured, except for a few non-critical items. Assembly of the accelerator is well advanced and ion source is on-going. • A review of the fabrication of the main components and aspects of their assembly is reported in this paper, with a focus on the main achievements. The MITICA (Megavolt ITER Injector and Concept Advancement) experiment, currently in the installation and commissioning phase at the Neutral Beam Test Facility in Padua-Italy, will be equipped with a Beam Source (BS) expected to generate a 40A negative ion beam to the energy of 1MeV (values for D). It is composed of an ion source to generate a H or D plasma and of a multiple-Aperture multiple-grid (MAMuG) Accelerator [1] , where ions extracted are accelerated in five consecutive stages of 200 kV each. The engineering and fabrication of the beam source for MITICA BS started in October 2018, when a contract between Fusion for Energy (F4E) and Alsymex (France) was signed. Presently, all the components and sub-assemblies have been manufactured, except for a few non-critical items. Assembly of the accelerator is well advanced and ion source is on-going. A review of the fabrication of the main components and aspects of their assembly is reported in this paper, with a focus on the main achievements. [ABSTRACT FROM AUTHOR]