Since we're on the subject of Pentiums and that era, I picked this up the other day. (middle one!) I have installed drives and drive blanks, something to replace the missing power button, and cleaned it up a bit since I got it.
Currently waiting on a soldering iron to arrive so I can modify the Dallas RTC clone with a coin cell, and I've just given everything a once over, taken the PSU apart to have a look at it, etc.
It looks good to me, but currently untested. I want to make sure all my ducks are in a row before I do the first test power up!
The DVD drive is just temporary, it will have a CD drive in it so its more period.
I added the USB riser, but I still need to meter out the USB header to make sure I put the pins in the right places. I also had to re-mount the serial connector because its standoffs were missing. I robbed some from a GTX480
Soyo SY-5VA Socket 7 Motherboard
Pentium MMX 166MHz
Samsung 256K Pipeline Burst Cache
SDRAM (unknown capacity)
Diamond Stealth SE (S3 Trio32)
ESS AudioDrive PT-230X
Vastec NT-200T 200W AT PSU
Got an 8GB WD hard drive coming for it. I'm going to try it with Windows 95D Lite at first, but it may end up with 98SE depending on whether I can get USB peripherals to work or not.