Or like $400,000+ if you are hiring a team of mechanical, electrical and software engineers to design an make it for you because neither you nor any individual on your team has his entire set of skills.
Or like $1,000,000+ if you are hiring some company to design and build it for you
Fortunately for the OP that's not how he thought about this. People who put a value on their time for everything are invariably terrible company for anything that is fun, will teach you something or that is useful to others rather than only immediately to themselves.
OP obviously enjoys building and showing stuff off. If they valued their time they would be building smart watches instead of mindlessly browsing social media or watching TV.
Or like $1,000,000+ if you are hiring some company to design and build it for you