I just got a full size PSU (Seasonic Prime 750) a few months ago because my old PSU died. Then I realize not that many itx case can accept the new one.
My mobo is also dying (most of the USB port are dead) and GPU is GTX 670, but still usable.
The reason of this custom case is for me to transition to SFF without spending a fortune on everything new. The rough diagram is currently at 15L, and going to refine it and see how it goes.
Green: Graphic card 300mm
Red: Standard size PSU, 150mm x 170mm
Blue: AIO 120mm watercool
Void space: A bunch of existing HDD and SSD (not ready to upgrade to M2 ssd yet, but soon)
My question of the layout is the orientation.
Radiator, GPU, and PSU should vent out, but which orientation would be best.