Depending upon how long the full-size graphics card is, the Dan A4-SFX [1][2], NCase M1 [3][4], and NFC Systems S4 Mini [5][6] mITX cases might be worth a look.

[1] https://www.dan-cases.com/dana4.php

[2] https://smallformfactor.net/forum/threads/dan-a4-sfx-the-sma...

[3] https://www.ncases.com/

[4] https://hardforum.com/threads/ncase-m1-a-crowdfunded-mini-it...

[5] http://nfc-systems.com/shop/s4-mini-chassis

[6] https://smallformfactor.net/forum/threads/nfc-systems-s4-min...