The proposed effort aims to design and additively manufacture a highly-integrated 12U-class spacecraft bus to demonstrate increased performance, functionality and payload volume (relative to todays conventionally assembled spacecraft that use a variety of commoditized components from different suppliers and integrate them together in a bolt-on manner).Specific Phase I activities will include a critical characterization of application goals to derive system requirements, identification and design of integrated architectures, and component down-selection to realize a high payload mass fraction system with integrated and conformal propulsion, on-board processing, and a variety of other enabling attributes to offer the next generation of intelligent, autonomous and highly-functional spacecraft for military and commercial use.Integrated spacecraft,Conformal,additive manufacturing,Propulsion,Autonomy,On-board processing,12U,high payload mass fraction