As Bunsen writes about empty solder pads to mount memory units it reminds me to ask for basic information regarding "FrankenRAM" modules. I would like to make a single 48 MB module from two 24 MB modules with plenty of empty solder pads for memory units. But I do not want to end up with one broken module made from two working modules

If anymone could provide a story of success on how to produce a living Franken(V)RAM module using memory units from several smaller modules, please share the details.