Close up of the PC holder. A beam is hanging off of one of the desk's struts. The PC is clamped to the beam using two metal plates.
https://tooting.ch/system/media_attachments/files/110/388/804/665/830/281/original/cb03079ce7653881.jpg
Finally got a cable management solution for my desk, including a holder for my PC.
Here is a before and after comparison.
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