The box where I'm working on the grml-kernel is a grml-system and is running since grml 0.2 without any problems. It has been installed using one of the earliest versions of grml2hd (the program for installing grml to harddisk).
Now it was time to install grml on my main developing machine: my laptop. That's the box where I'm doing my main work on grml. Steps:
booting grml (currently grml 0.3-4a)
grml2hd /dev/hda2 -mbr /dev/hda
ajdusted /etc/fstab and /etc/passwd (I took over my old /home and of course /Grml)
That's it. It took not even 30 minutes to get a running and working Linux.