@Tetrium
Thanks for the heads up. I won't be doing much tweaking/overclocking and initially I will make it run on a 650 Mhz PIII. Maybe later I will try to get a Slot 1 > Socket 370 adapter and a Coppermine or Tualatin at 1 Ghz. As @Kamerat mentions, it shouldn't be much of a hassle as long as the BIOS is downgraded.
I live in Sweden and it makes it more difficult to get old hardware (at favorable prices), so I'll start with this and see where it leads 😀
I purchased a Geforce 4 Ti 4200 (AGP) today and some memory, so currently the build looks like this:
MB: Intel SE440BX-2
CPU: PIII 650 Mhz
GPU: Geforce 4 Ti 4200 (APG)
Memory: 128MB
Planning to buy the YMF718-S for ISA/DOS audio and a SB Audigy 2 ZS for PCI/Windows 98 audio.
Chassis will come later once I've tested the build.
Regarding PSU - it shouldn't be a problem using a modern one, right? I prefer stability over going 100% retro on all parts.
Haven't decided on hard drives (or alternate hard drives e.g. SD cards) yet. Will look through PhilsComputerLab's videos and see. If you got any suggestions, let me know!
Thanks again guys