Thanks for noticing the detail; it's one of our favorites and several of our clients have expressed appreciation. And you can't go wrong with Robern cabinets.
The frame is not attached to the door of the medicine cabinet. It is set slightly away from the door on all sides to allow room to reach in on the side of the mirror to open the door. I hope this answers your question; if not, let us know.
Ossolinski Architects, PLLC