A carrier module for a motor vehicle door assembly having inner and outer panels defining a door panel structure with the inner panel having an opening for selective access to an internal door cavity between the inner and outer panels are provided. The carrier module includes a carrier having an outer periphery configured for attachment to the inner panel to substantially close off the opening with the outer periphery bounding a wall having a variable wall thickness with support regions of the wall having an increased thickness relative to adjacent non-support regions.