Well, I did not do exactly what I intended. First of all I should mention that I've not yet been able to install it yet.

During my install tries it looked like whenever I chose LILO, grub showed up after reebot, as mentioned before. I suspected that LILO was not "able" to override grub somehow and so to verify my suspicion I installed WinXP on the SATA drive, just to kill anything on the MBR.
After this I tried to install Knoppix 3.6, debian, with LILO but when rebooting it was not even able to read from the MBR and told me to insert something bootable.
Since then I've had a break. I will however try what I wrote about in the last post and I'll tell you how it turns out as soon as I get my motivation back .

Another thing that has made me wonder is that, after successfull execution of the knoppix-installer there are a bunch of error messages in the terminal window that I can not make any sense out of, still the installer says that it compleated successfully! Am I the only one with these error messags? (yeah, I know that if I posted the messages it would be a lot easier for you to confirme this, but ... yeah; but what!?