Mika Tomczak: These concept sketches portray three different elements of the events depicted in the falling service elevator storyboard. Please read through the storyboard and the diagram below before reviewing these sketches.

diagram
The Layout: To secretly reach the Director's office, guests must board an old service elevator. Upon entering, the suspension cables snap and guests plummet several floors underground, landing at the entrace to a secret tunnel. This diagram shows the flow of guests through, and the location of critical elements in, the service elevator gag.
door
The Elevator Entrance: After receiving the mission brief in the Tech Ops Room, the recently recrutied guests will be informed that the only way to secretly enter the Director's home is via a secret underground tunnel connecting it and headquarters. The guests can access the underground tunnel by taking an old service elevator. The guide assures guests that although it hasn't been used in many years, the elevator is still safe enough to ride. The entrance to the elevator may appear as shown above; the doorway is meant to look old and neglected.
cage
The Elevator Car: The elevator itself, which has a 6' x 6' footprint, has two doors: one through which the guests enter, and one 90 degrees clockwise of the entrance through which the guests exit. The elevator car itself has vertically sliding grated doors that rise when guests enter and leave, and remain lowered during the "ride". The cage/grates on the walls insure that guests do not touch the scrolling effect walls around them, while allowing the guests to see and "feel" the falling effect. Note that most service elevators feature inner safety grates such as these.
control box
The Elevator Control Panel: The service elevator will feature a control interface with which the guide interacts to "control" the elevator. The control panel features the standard "up" and "down" buttons that are usually found in elevators; in addition, it has an emergency button in red (which the guide will press when the elevator starts to fall) and several warning lights (in orange) that will illuminate when the elevator misbehaves. There are also toggle switches for the guide to flip, to simulate the feeling of panic. Note that the whole control box unit will be taller than shown; I ran out of paper (vertically) when drawing the above sketch.
The related storyboards can be found at the storyboard main page.