The high quality replies I received (especially from Jens B. Jorgensen) solved my problem. (see http://www.debian.org/Lists-Archives/debian-user-0001/msg02027.html)
It also gave me an idea: Wouldn't it be great if there was ONE Linux boot-floppy that would mount (SMB or NFS?) a complete filesystem after the initial boot over a network (and complete the boot sequence?). I'm probable not the first who came up with this idea, so does anyone know If such a thing is already pulled off? Regards, Onno