One short word of explanation for that. The script trim-workstation-base.sh uninstalls unnecessary packages, and installs necessary packages. Of course, I could have provided a set of tagfiles, but a) the script also works for existing installations, and b) nowadays tagfiles seem to have fallen into oblivion.
On top of that, three SalixOS packages replace stock Slackware packages: kde-baseapps-lite (without Konqueror), KMix and K3B (enhanced). I decided to go for the Salix packages on top of the existing Slackware packages, because the Salix folks care about 100% compatibility with the "mother" distribution and do some very clean work.