I would consider my skills and available tools/materials, come up with a construction, and use google and the stupid question thread when issues arise. I'd go through several design iterations, considering various advantages and drawbacks of different methods. Eventually I'd settle on 2-3 variants that seem promising. Only after that I'd present my plans to /diy/ and make a thread asking for feedback and posting pictures of my progress.
But I don't have a dentist's chair, so it's more of a hypothetical thing.
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