Great minds think alike - my current favorite is very much in line with yours!
Started out as a complete DTK machine witch I've more or less ignored for years. The original board is a DTK PRM-0080i, and it came with a TNT2 M64 and a 650MHz slot 1 pentium 3 CPU, but I've replaced the mainboard with an Abit BH6 witch is more flexible. Before the BH6 I had a Shuttle socket 370 mobo + a VIA C3 Nemiah 1200, but it turned out the Shuttle board did not fully support the Nemiah* so I put that setup on hold until I can find a truly compatible board with an ISA slot.
Right now the DTK case holds the following:
Coppermine Pentium III 1100MHz FSB100 (SL5QW) + slotket
Unlocked Pentium II 333MHz on hand in case I want to run more sensitive DOS games (this sample can go from 2x66 to 5x100 on the BH6)
Abit BH6 mainboard
256MB of PC133 SDRAM running at 100MHz CL2
Asus Geforce 3 Ti200 AGP-V8200T2
Skywell Magic 3D II Voodoo 2 12MB
Creative Labs CT2950 SB-16
Roland SoundCanvas SC-55mkII
40GB Western Digital HDD
Sony DVD-ROM drive
350W FSP 80+ PSU
DTK Desktop ATX case
19" Delta 992 CRT (DTK branded)
IBM Model M
Razer Dethstalker Essential (for windows games)
Agiler BMT400 PS2 (for DOS games)
*turns out the setup took a serious performance hit on the Shuttle mainboard (VIA 693A chipset) when running the Nemiah chip. I was getting 270MB/sec memory read speeds with the nemiah, while it got 550mb/sec with an 800MHz Samuel C3 and 700MB with a 933MHz coppermine Pentium 3 so something is amiss - most likely the Shuttle board does not fully support the Nemiah core.