Errr... oops... I forgot to remove the inital build's archive from the laptop's HD. That's accounting for over 300 megs. Remove that, as well as the stuff in ccache's spool and /usr/portage/distfiles, and the whole setup goes under 1 gig. Tarballing that with bzip2 compression should get me under 700 megs eazily.
$DEITY DAMMIT! I installed Win2K on it, and the sound worked. Now I know somethings amiss. I'm now slapping Gentoo back on it from my whole-disk tarball, which compressed down to about 304 megs. I know the settings need tweaking.