Rick
Certified Enneadecagon Designer
Maybe it was built out as after thought so that the could run the electrical. so you wouldn't see the cords. Here is what they look like with the cord showing. Not nearly as cool.
Highly doubtful, especially with a drop ceiling, you can pull the electrical through the wall up to the drop ceiling and tie the electrical together... plus, you don't need 3" to run electrical through the wall - but you would for a slim cabinet...
If the OP is building this for this particular franchise, they would call out that particular system... I have worked on franchise signage standards, I tend to stay away from stock cabinet system where the LED's are provided, first thing is, they are usually not to keen on modification - especially when needing to add more LED's... many use inferior electrical components. Looking at other locations of this particular franchise, most are using different systems or fabricating their own so I'm sure it's up to the shop to provide their own type of illumination method. Some, like this particular franchise is flat against the wall, other franchise stores are stood off the wall, others are using cable/clamps to hold the graphics in place.
If it were me, I would stay away from a stock system unless they are easily modified - in case they require more LED's or for servicing...
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