I installed the new disk on my laptop, which has a P3 750 in it. If you do similar, be careful to:
-"update" to a kernel rpm of the appropriate arch; i'm using i386 for cautiousness but i586 should work
-"update" to a glibc rpm also of i386 and not the i686 rpm you got
-ldd /sbin/init and see if it wants /lib/i686/...
If so, create /lib/i386, copy stuff from /lib into it to make it match /lib/i686, and then move /lib/i686 out of the way and create a symlink to /lib/i386 called /lib/i686
sndconfig happily configured the audio but the speakers are currently disconnected for other reasons
i didn't let kudzu configure X; instead i ran Xconfigurator, told it Generic LCD display, 16bpp @ 800x600, 2mb video memory, and all was well.
now i just need to get a useful audio mod (the last one tried causes a rhythmic popping in one speaker and needs to be undone) and fix the internalized usb ethernet; the cable from the second usb port to the now-daughterboard seems to have gone bad.