Good god, you are Elton John!! Lol!
Seriously though, a walk-in closet on a smaller scale, is not impossible.
Even if it's only small enough to be able to just "stand within it" with sunglasses to the front and either side, rather than "walk-in", might make more sense in terms of space, than having multiple glass cabinets.
Safer and more discreet too, from a security perspective, as once closed and locked, cannot be seen.
The various generic clear plastic holders/racks (which is what I have), only display the frames, plus, I'm always worried they might fall off with the slightest knock!
I'd like to have my eyewear displayed alongside their cases, as the cases are nice too.
It would be better if I used high gloss wooden display "duckets" rather than clear plastic racks and custom fitted them into a closet, with each "ducket" able to display the frame and case, original lenses (if customs are fitted) + a small plaque or card with info/background on the frame.
With the right lighting to compliment, it could end up something really special.
I going to think about emptying a closet and testing those DIY and craftsmanship skills to the max!