Apologies for my absence from the discussions; especially this one.
Looking at that pair you made, looks like a professional design.
Speaking of the modeling aspect, I've done some more complex mechanical models, on which I am currently working on other aspects of, some of them are in the "rigging readiness room". LOL
I do plan to make a few different types of spectacles, some of my own design. Rigging will be simple for most of them. I do have an odd design in mind, that I need to figure out the way its joints will work. That will determine the shape of the part. I'm drawn to ball joints, because of their hinging freedom. Just make the center of rotation for all axes the center of the ball.