It’s a Light Sixer Sears Tele-Games with a thin Mini-ITX motherboard and a 120gb SSD. It’s a Celeron 847 (not exactly a hoss), but it doesn’t do too poorly with “vanilla” Minecraft on Windows 10.

Since these pics I’ve cut out more of the bottom of the unit and routed the cables more tightly for cooling. I also added a blue power LED that needs a resistor, as it’s blindingly bright at night.