I couldn't be the only one dreaming a mini case to house both Mac Mini and external gpu setup together. If only I know some CAD modelling and programs, then I would start the project immediately.
Similar thing was spoken here also;
egpu.io
Setup consists of Mac Mini, NVMe TB3 enclosure (sth. like Wavlink UTE02), PCIe x16 to M.2 NVMe eGPU Adapter (like ADT Link R43SG) and a psu like SF600 or maybe SF750. Putting inside a case will make already hot Mac Mini hotter. So, maybe, such case can accomodate interals of Mac Mini (logic board and its psu) and can offer custom cpu cooler.
This might be the ultimate highly customizable non-Pro Mac.
Is there anyone willing to design such case?
Similar thing was spoken here also;

2019 16" MacBook Pro (RP5500M) [9th,8C,H] + RX 5700 @ 32Gbps...
This is my first attempt with M.2 eGPU Adapter which caters to laptops without Thunderbolt 3 connectivity. Thanks to NVMe M.2 Thunderbolt 3 enclosures...

Setup consists of Mac Mini, NVMe TB3 enclosure (sth. like Wavlink UTE02), PCIe x16 to M.2 NVMe eGPU Adapter (like ADT Link R43SG) and a psu like SF600 or maybe SF750. Putting inside a case will make already hot Mac Mini hotter. So, maybe, such case can accomodate interals of Mac Mini (logic board and its psu) and can offer custom cpu cooler.
This might be the ultimate highly customizable non-Pro Mac.
Is there anyone willing to design such case?