3D print your own PC case.
Supports 240mm AIO, a full-size GPU, and more.
Build plate of my 3D printer (28cm x 24cm x 30cm). As few overhangs as possible with absolute minimal support material needed. Fits standard off-the-shelf ITX/SFF components. Grip nut construction. Easy to open up and work on.
More information here: https://smallformfactor.net/forum/threads/heartcase-3d-printed-itx-12l-case-v1-0.16344
INSTRUCTIONS:
If you are happy with the temps you can undo the front I/O and slide the outer case on. Attach the front I/O again and snap the front panel on. Screw the outer sleeve on underneath at the front and back.
Parts list:
front i/o - https://www.overclockers.co.uk/lazer3d-front-i-o-panel-2-x-usb3.0-40cm-cables-ca-01y-lz.html
PCI E Riser - https://www.ebay.co.uk/itm/PCI-E-X16-Express-Riser-Card-Extender-Extension-Port-Adapters-Cable-24cm-Length/254344829519
180 Degree Angled GPU Connector 1 - https://www.ebay.co.uk/itm/2x-180-Degree-Angled-Turning-Connector-Desktops-GPU-ATX-8-Pin-Power-Adapter/224171189090
180 Degree Angled GPU Connector 2 - https://www.ebay.co.uk/itm/2x-180-Degree-Angled-Connector-Graphics-Card-ATX-6-Pin-Power-Supply-Adapter/402762950697
Audio Extension - https://www.ebay.co.uk/itm/Akasa-EXAUDI-40-HD-audio-internal-extension-40cm/302358326880
Power extension cable - from anywhere.
Grip Nuts - https://www.aliexpress.com/item/1005001467877770.html?spm=a2g0s.9042311.0.0.40c34c4dwkjJF0
Screws - https://www.aliexpress.com/item/4001010449485.html?spm=a2g0s.9042311.0.0.40c34c4dwkjJF0
Disclaimer: This is an educational experiment and should not be used as a working computer case.