[leoc]

You could probably build an eGPU box with the same footprint as the 2018 Mini for stacking above it: it should be just possible to fit a small-form-factor GPU in that space. It would be a lot less unwieldy and weird-looking than plunking a normal full-sized eGPU next to the Mini.

[gehwartzen]

The Sonnet Puck pretty much has that form factor (just not a matched case material) but tops out with an RX570 and uses MXM form factor cards so a bit less than ideal.

[_ph_]

especially, if the card would be in vertical, there should be place for a full-sized gpu.