An electronic component module assembly includes a printed wiring board, and a stiffener assembly affixed to a first side of the printed wiring board. The stiffener assembly includes an outer stiffener secured to the printed wiring board, an inner stiffener removably located in an opening of the outer stiffener. The inner stiffener has one or more inner stiffener pockets formed therein, and one or more electronic components are installed in one or more inner stiffener pockets, and electrically connected to the printed wiring board.