A method of manufacturing a modular semiconductor subassembly: providing at least one semiconductor subassembly having a modular sidewall element of modular dimensions and a semiconductor substrate base element coupled to the modular sidewall element that has at least one semiconductor element with a layout sized to be accommodated by modular dimensions of the modular sidewall element. If a modular package protective cover is to be used: providing the modular package protective cover configured to accommodate the semiconductor subassembly in accordance with a modular design; securing the semiconductor subassembly in the modular package protective cover to create a modular package assembly; and mounting the modular package assembly to a core, with a base side of the semiconductor substrate base element in contact with the core; otherwise: mounting the at semiconductor subassembly to the core, with the base side of the semiconductor substrate base element in contact with the core.