Here is one of the most elegant small form factor gaming PCs money can buy. The Fractal Design Terra Jade has an anodized aluminum exterior with a 8mm thick aluminum front section. It also has a walnut front panel. It has room for GPUs up to 322mm. It has room for two x 2.5″ SSDs.
This PC case has an aluminum power button and two USB ports (including a USB-C port). It has a tab and lift mechanism for opening the side panels easily.