Abstract: A single piece frame (12) for a spacecraft, the frame manufactured as fiber composite sheets (40, 42) overlaying a core (38). The core (38) is preferably made of aluminum and formed with a honeycomb cross-section. The frame (12) provides a mounting structure to which payload, spacecraft equipment, and boost vehicle are attached. The frame (12) can be reinforced locally by varying the core density or the wall thickness so as to resist concentrated or localized loads. The orientation of the fiber in the composite sheets may also be varied so as to strengthen the frame in a desired location.