One does not have to add anything to the Names.cfg file and that one does not need a new model. Basically a PLUG-IN capability. It will not render a savegame unusable if you remove the mod (when in base). That's possible by simply linking the new CFGs to the original files instead of replacing them or adding new ones.
See: If I would start a new career with copies of old ships (e.g. the merchant pack above) and would remove the mod, any savegame would be unusable as they would link to units that do no longer exist. If you use the plug-in mod you can remove it easily as the savegame files link to the original units that are still there.
It's hard to explain for me, but a quick look at my file^ and you see how easy it is.
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