Thanks. Can anyone give me a brief step by step on what the rough-in process is like for this?
You mention Lutron or other brands. You need to be more specific on the system.
If you are seeing large Lutron panels with dimmer modules you are seeing Homeworks.
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All lighting zones get run back to the Lutron panels. Keypad controls are run in a daisy chain pattern using a proprietary cable that has a pair of power conductors and a pair of shielded data wires. The number of keypads per loop depend on the exact devices used.
You can also have wireless keypads (They need 120V power) and wireless local dimmers.
There are many options for the systems. Only certified installers can buy and program the system. Certification requires training and minimum annual commitment of product purchased. They also restrict number of dealers to areas.