I tried the following with DSL 0.8.4 2004-11-10. The remastering scripts are successful on Knoppix because they were written to use the program known as dialog which is obviously included on Knoppix. If you run the scripts in DSL, the scripts use dialog, which is really a symbolic link to /usr/bin/whiptail and this whiptail program does not seem to be a full implementation of dialog. Thus the script appears to work and then fails.

I tried to get dialog to work by downloading a official Debian .deb file for dialog. I extracted out the data.tar.gz file and ran dialog. It complained that it could not find a shared library. I gather this means that the Debian package is not a static binary. To solve this problem I would have to compile a static binary of dialog while in Knoppix, save it to my hard drive and then boot into DSL and see if it works. I won't be doing all that since I feel DSL is too customized to be remastered with Fabian's scripts without major hacks & modifications. In particular some of the scripts refer to apt-get which is not on DSL.
I hope this helps.
James