Electrical - Wiring a sconce from a valence


I am currently in the design stage of my new kitchen. I plan to install new cabinets. In some cases, I plan to create a valence where two cabinets surround a window. I would like to hang a sconce in front of the window.
Here is my plan,
Attach a horizontal cabinet "ceiling" board to the surrounding cabinets to attach a ceiling box to hang the sconce from. I would run the electrical behind the drywall and expose it an inch or two above the cabinet "ceiling" board through a hole in the drywall with enough extra to attach it to the ceiling box.
My question is, can I run the Romex (14/2-lights only) unprotected from the hole in the drywall to the ceiling box or do I need to protect it with metal sheathing? The height is ~7' 6" above the floor.
Do you have any suggestions or modifications to this plan?
Much appreciated and Happy Holidays,
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I put a shelf across the top of a window ~3 feet. I used 1.25 thick material cause I wanted to put some weight on the shelf. I screwed the shelf in from the ends........ I found that anything more than 3 pounds in the middle deflected the shelf. Which for my purpose was ok.
Sconces where I live are wall fixtures. Where as you may be talking about pendant/ceiling fixture. your going to need to protect the romex. Height is not a factor. Romex has to be protected if exposed. Wire mold is always an option. I "understand" that you may have forgotten the box that will need to be installed for the 'ceiling" board.
Have fun with the remodel.
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Ahh, yes. You are correct. I truly meant a pendant light.
Thank you for you feedback,
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