Regrettably, there are caviats with that still...This is rather off-topic so do I apologize, but your setup gave me a little inspiration. A couple of my friends were talking about how they wanted a case with a detachable eGPU which could be plugged into their laptops as they pleased. Your setup essentially chopped in two would accomplish that; the Meanwell being dedicated to the GPU means that it could also theoretically run by itself without a desktop PC powering it.
The intent would be to have the case detach into two pieces. When "joined," the GPU would still plug into the PCI-E slot, not Thunderbolt. It would only run slower on a laptop, not the desktop.Regrettably, there are caviats with that still...
I wanted to do pretty much the same thing:
Build my desktop in a fan-less silent case, buy an external eGPU box (most likely the one from Gigabyte)
Other than the fact that you'd have to shut down your PC every time you wanted to connect/disconnect this (no PCIe hot-swap on consumer platforms, and hot-swapping GPUs isn't easy or stable even on server tech), this should be doable. You'd need to design your cases with very tight tolerances, and likely use two PCIe risers (one in each case) to get the connectors in appropriate locations. Also, you'd need to figure out some way to lock the cases together when connected that's both secure and easy to use. Accidental disconnects might kill hardware. Are you thinking of having separate PSUs in the two parts? If so, you'd have to rig up some sort of load switch connecting the two so that the GPU isn't receiving 12V even when disconnected. If not, you'd need a way of routing power to the second case as well, though removing the locking pins from standard PCIe power cables might do the job.The intent would be to have the case detach into two pieces. When "joined," the GPU would still plug into the PCI-E slot, not Thunderbolt. It would only run slower on a laptop, not the desktop.