[khafra]

I doubt you could sell anything like that without at least being able to build a prototype, so perhaps that'd make a better first step than a patent application: Learn how to work with thermoplastic, rent some time with a CNC machine, teach yourself to whittle--whatever it takes.

[Pipedreamergrey]

Thanks, that's useful advice. Googling CNC machine, I see that I can download software for some models to tinker with, to see how difficult that might be.