Instead of putting models and parts into tables or a spreadsheet why not pretend to be Sega?
Using some PLM (product life cycle management) software we can link together the various models, revisions, assemblies, parts, and alternates as if we were Sega actually making these products. Then attach relevant datasheets, photos, and links to those.
Along with that, I can create a database library in Altium of the various parts. This ideally will be linked to the PLM software so I don't have to do things twice. Which can be used to make schematics or entire replacement PCBs if someone was so inclined.
Although a bit nuts people have been trying to keep track of the different models and part numbers over the years, why not actually do it the right way? Plus it'll be useful for research and repairs.