Its easy enough to remaster in graphical mode. Boot the CD with a cheatcode to runlevel 2. Move /etc/skel to /home/knoppix in the chrooted remaster filesystem. Chown -R /home/knoppix to knoppix:knoppix. Create a /home/knoppix/.xinitrc file with contents:

startkde


Then:
su knoppix
startx

When done move home/knoppix/bacxk to /etc/skel and chown -R etc/skel back to root:root