I’ve created an optimized Linux From Scratch build environment using Slackware 14.0 and exported it as an Oracle VirtualBox Appliance to ease installation. The size was kept to minimum (less than 200 MB) and the packages included are as follows.
You can get the appliance here.
You can get the tagfiles to modify your Slackware ISO as well as a floppy image with the tagfiles included here.
NOTE: Login as root with password slack