The key issues associated with the three maintenance approaches envisaged for the Compact Stellarator (CS) power core have been identified and addressed, and the layout of coil system, coil supporting structure, cryostats, vacuum vessel and maintenance ports have been conceptually defined. These are summarized in this paper. Blanket concepts compatible with the three maintenance approaches have been investigated, and will be reported in separate papers. State-of-art CAD tools have been used in this study to verify clearances for blanket movements during maintenance operations and to determine the maximum size of the blanket replacement units.