This is a weird one for me. I'm actually kind of happy with the design, but not with the overall outcome. Tl;DR, as cool as this thing is, it sags even without the weight of cables pulling it down. After taking the photos, I switched back to using a simple 1U metal shelf.
So why am I sharing a project I don't endorse? Mostly because I learned a LOT while making it (like, embossing is one of my new favorite CAD tools). Maybe someone will find my learnings informative and build upon them. I've attached the original Fusion 360 file along with step files for each design iterations including a topless version I never completed.
Some notes if you choose to print this:
The author remixed this model.
This upload includes a few mixes made through a few iterations.
I also changed how the PCs are locked into the print with a simple little locking plate.