Years ago I had a customer who wanted me to build a replica of a Warwick Dolphin bass and I told him I couldn't do it. It's a unique design, a sculpture if you will and it is to their credit. I found out what he liked about it and then modified the design to include those points. So it kinda-sorta has that look but with slight mods so as not to blatantly rip it off. I would never even consider copying the head stock design.
The acoustic guitar however, at this point, has been designed and redesigned so many times I don't really see how anyone can actually take ownership of it unless there is some structural revolutionary design like say a Nomex double top or something. Other then that what can you do? Patent the mathematics that make up the curves of the upper and lower bouts? Headstock and bridge design? Inlay? End graft? And so on...
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