The work of this thesis concerns the development of the structural subsystem and the realization of the internal configuration of the SPEISAT spacecraft, developed as part of the Spei Satelles mission, carried out by a team of Politecnico di Torino for the Italian Space Agency, on behalf of Vatican City. Such task has been conducted in a time span of 4 months through an iterative process based on the concurrent engineering philosophy, with the goal of achieving the realization of a shell capable of housing the different subsystems while withstanding the loads caused by the launch and the harsh conditions of the space environment.