My experience from a fresh install on real hardware:
System: Gateway 2000 G6-300
CPU: Intel Pentium 2 300MHz
RAM: 128mb SDRAM (1 stick)
HDD: 5GB + 2GB (C: and D:)
Video: Mpact2 3DVD onboard AGP video (drivers were a pain to find)
Monitor: Dell 1905FP Monitor via VGA
Misc: DVD, Creative onboard sound, floppy, usb keyboard and mouse
Formatted both internal hdd on another PC because old school formatting takes forever. Installed Windows 98 SE, installed all my drivers via network share (was able to turn on SMBv1, etc), rebooted until no more reboots were needed.
Attempted 3.66 Unofficial SP3, hang at installing main. Saw 3.65 was working so installed 3.65 main, rebooted until it was done. Installed 3.66 SP3, this time it worked as stated.
Rebooting says it's missing "Enable.vxd". This didn't stop the machine from booting, just had to confirm once. Found a post from 2021 that briefly mentions it and included the file in an attachment. Copied that over and rebooted again. All is working.
I'll remove the drive and image it, then go back and install extras.
Thanks to all for their hard work on this.