Shame that tutorial never materialised! I'm currently struggling to install: OS9, Tiger, Sorbet, MorphOS and Linux. I can install OS9 no problem at all by booting into the OS9Lives Previously Unsupported G4 CD and use it to initialise the hard drive with 5 partitions: OS9, Tiger, Sorbet, MorphOS Boot (HFS 64mb) and 8GB for MorphOS System leaving the rest of the drive unpartitioned so that linux can sort that bit out later on.
IF I only install OS9, Tiger and Sorbet I am then able to install Debian (with Grub) and Lubuntu (with Yaboot) and even Adelie and OpenBSD no problem. It's when I come to install MorphOS that things get messy. The moment MorphOS is installed it messes with the partition table and is no longer available to linux.
So for example, if I install it before linux, then I can't install linux at all. If I install it last of all I have all the OS installs complete but still end up with a messed up partition table as far as linux is concerned. I've looked into restoring the table but can't figure it out. If MorphOS didn't screw with the partitions it'd be just as simple as installing OpenBSD!