DIY Flat Power Cable

Hopefully this is the right forum for this but I am looking to build or buy a flat IEC power cable as I need to plug it into an outlet inside a cabinet and run it under the glass cabinet doors to my speaker's power supplies. I looked all around for a commercial solution but was unable to find anything but I assume someone has built something similar using bulk ribbon cable or something like that. Any tips or advice? Thanks in advance!
 

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If you buy a mains rated prebuilt cable as shown above, also get the proper grinding wheel (diamond?) and grind/cut a notch on glass door edge so it never ever even touches wire insulation.
They are flat as in side by side on the same plane but not "thin".