I already did that. But I used the standard KNOPPIX system for that, which includes rdesktop.
There are easy ways to configure a KNOPPIX (even a KNOPPIX without rdesktop) using the plugscript package.
http://rcswww.urz.tu-dresden.de/~holzhey/plugscript
Unfortunately there is a lot of code at the moment, but no special howto for using it, but I can prepare a small package for you (200kb+optional rdesktop) which then is very simple to install.

If you want that, please ask me at [email protected] .
Andre'