Does it work to clone a branded speaker? See the case of this Gradiente Master 100

It seems like a good idea to copy a famous loudspeaker design, rather than making your own design for a speaker you intend to use.
However, in our opinion, the copy will hardly have the same performance as the original box, as shown by this analysis and test of a clone of the famous Gradiente Master 100.
EXPLANATION:
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A loudspeaker must be designed according to the speakers, and this can become a problem. The sound of a loudspeaker is the result of a number of elements such as cone weight and type, suspension flexibility, coil dimensions, coil wire, glue and magnet. Even using the carcass of a certain original speaker, if the person who refurbished a speaker does not have access to these items exactly like the originals, then the refurbished speaker may even work again, but it will never be the same as the original. . Therefore, a box that was built for a particular speaker will probably not fit the refurbished speaker.
Who wants to build their own box, but does not have the necessary knowledge to do the project (from a speaker) needs to resort to a designer or, by the shortest way, can take a commercial project and copy. However, the result is generally doubtful, even when using the original speakers, only reconditioned.
The worst thing is that many people end up selling the copies as if they were the original boxes, sometimes even in good faith. But the copy turns out to be simply a copy, with a quality different from the original,