I needed a small-as-possible case for an flexATX motherboard that can accomodate a full-height graphic card. This is as small as it can get, with the width and depth of the case just enough for the board, and the height just enough for the graphics card.

It should also be easy enough to modify this into a closed case. There is still room for an extra SSD and a full 3.5in HDD (if we ditch the side fan and ensure to only use low-power CPUs like the Intel T series); or to put a liquid cooler there if we want to use a higher powered CPU.

EDIT: uploaded an old version of the dxf file. New one should be up now