This machine was put together quite innocently to be my daily driver - before I'd even heard of the term Sleeper PC. The case was manufactured in 1997 and was probably originally intended for a server. Inside are two 18 core Xeons with 256gb of Ram, a 15k SAS Raid Array and a 3080ti graphics card. The display is a massive 22" CRT with a Diamondtron tube.
This video shows the finished machine and shows some basic benchmarks, then runs through a small selection of games to see how they run.