When I ask an artisan to take my idea, Rough draft, and then cut him off the chain with free will to do as he wishes and what is going to work thats a custom.
Just because you gotta big block 427 Cobra Jet motor. Does not a Muscle car make. A blade that is tweeked and Scales that are fiitted into a new shape configuration and or set of materials is custom.
If not go buy a Ford focus off the line and drive happy in ignorance it is bliss for the masses.
Do you have one exactly like it? Even close?? Than its a custom. Did you get to collaborate with the builder?? Did he ask you what is most important to you and then deliver a product thats better than expected that is a custom.
If you get a tattoo out of the photo book and go with it NO. When the artist sits down and draws a design just for you and freehand lays the ink thats a custom.
See what I like from a custom build
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Do you have one just like it?
No then this is a custom. By definition something other than a production model past or present.