I had a small workstation/web browsing PC but I wanted to be able to play games on it and give it to my girlfriend so we could game together. I used an m.2 to PCIe 16x Adapter to connect an RX 560 to the workstation and I used a power supply from a dead XYZ printing Pro 3D printer and soldered a PCIe connecter together. I 3D printed the holder for all these pieces and made sure to acomodate for airflow as to not overheat things. This likely only fits the exact hardware I used but shouldn't need a lot of tweaking to make work with other things.