Here is a mylivecd cl that I copied/adapted from a thread comment off kjpetrie. I has examples of selecting & ignoring specific folders for a backup live cd/dvd. The --nodir section is where you might play around. It also moves mylivecd temp area to /home partition which takes lots of space & you have plenty. Note that this cl calls for there to be /temp & /workdir in your desktop folder. This may give you something to start with.
mylivecd --nodir ^/root/temp,^/root/tmp,^/home,^/mnt,^/media,^/tmp,^/proc,^/dev,^/sys,^/var/lib/drakbackup,^/var/cache/apt/archives --root / --tmp /home/john/Desktop/temp/ --workdir /home/john/Desktop/workdir/ --md5sum pclos2010-05.5.iso