You're definitely right about this. Modding isn't something specific to digital games and it's something that I'll be addressing in my essay. I see your point with models for a doll house, and though it might technically be modding, I feel like it would be weird to call that "modding." I feel like there would be a better term for it, but I'm not sure what it would be... For modelling and replicas, that's something entirely different given that it's not modification the design of something, simply replicating it in my opinion. For this, the focus is on digital mods because attempting to tackle "modding" as a whole is entirely too much for this topic. The technicalities of the word are hard to nail down, however in my opinion, the best definition you could use is to say that in general, a mod is something that modifies an original piece of content in a new way through adding new content, changing existing content, or generally moving it away from what the original author released. It's also very broad, but I also think in general, when we say "mod" we're talking about a game in some way. The term could also be used for re-edits of a film, but in that case, it would be more accurate to say "re-edit" than mod. It's a hard question to pinpoint given the broadness of the term.