The very last ("optional") components of my Win98 build came today - a pair of 512 MB PC800 RIMMs, and a Tualatin-S 1.4 with socket adapter.
My Asus P3C-L BIOS doesn't properly recognize the Tualatin, and apparently will only auto-configure to 10x multiplier, so it says it's a "Pentium II at 1333 MHz" (HAH!) but CPU-Z in Windows 98 recognizes it properly, at full 1.4 GHz speed, even.
So the last thing to figure out is why my floppy drive doesn't work. I have an LS-120 drive, which the BIOS supports as a 1.44 MB "A: drive", so I'm good there; but my Teac dual-drive doesn't seem to have either its 3.5" or 5.25" sides recognized. Oh, and swap in a different optical drive. The one I have in it *WORKS*, but it doesn't eject properly, I have to physically eject with a pin-in-the-eject-hole.
Windows 98 sure is lightning fast on this system! Now to get some games loaded...