Two walls, one file. Every prop is a row with a switch; flip one and it leaves the room instantly, keeping its copy. Adding a prop is adding a row: a name, a wall, a position, a line of dialogue. This is the same control an admin screen gives you after launch.
Two walls, 27 hotspots, 16 objects. Lines are drafts in her voice — mark them up the way you did Kara’s. The album is switched off for now and drops in without a rebuild.