Just a remark, I'm bypassing the DVD burning step on the way to USB flash/Poor man's install by running qemu with USB access:
Code:
# lsusb
Bus 002 Device 006: ID 0951:1624 Kingston Technology
.....
#qemu -cdrom /store/download/iso/KNOPPIX_V6.7.0DVD-2011-08-01-EN.iso -hda /store/vm/qemu/knx670_disk.img -m 1024 -boot d -usb -usbdevice host:0951:1624 &
Then, run "Install Knoppix to flash disk" in the virtual machine. We could of course have copied the files directly from loop-mounted ISO, but this method allows us to check things
Also, the purging and installing steps prior to remastering can be carried out in qemu virtual machine sessions, making administrative tasks very much easier.