Not sure if there has been a case like this before, but I wanted to share the concept early to collect any feedback or suggestions regarding this design before I continue working on it. The basic concept started with the idea, of utilizing the wasted space typically provided just above the retention bracket for PCI Express slots. There is usually a gap there to allow the card to slide up, then back out of the case. I wanted to use this typically wasted space by placing a flex ATX bracket just above it. That would mean one would have to install the GPU first, then install and secure the Flex ATX unit, but I think the space savings are worth the extra hassle. A rough image of the idea is provided below. I believe a case of this layout could support a GPU of up to 210mm and stay under 5 liters.
Thoughts and feedback are appreciated!

Thoughts and feedback are appreciated!
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