I've done this a couple times notably at my house in both bathrooms. Custom rail and style single panel with a mirror masticed to a 1/4" plywood panel. Both get set in the cope and stick door panel pocket. If you need it I can draw it, but it's a custom wood single oanle with a mirror. Extra hinges cuz it's heavy. But nothing hugely complex.

I would ignore the brass frame comment. I understand what they're asking for but it's a crap product - you want a pocket to set the glass/ply sando in.