This commercial bookshelf does not appear to be a custom installation of any kind. It sets out in front of the wall, different than many bookcase doors. However this one is mounted do a door with sturdy hinges, and supported with a caster. The downfall to using...
These IKEA bookcases are connected together, then mounted on casters and large gate hinges to create a secret door. A “how-to” article is located on IKEA Hackers.The extra wide door pivots open to reveal a hidden furnace closet room...