Just upgraded my old ibook g4 to a cheap SSD I picked up on ebay (I use it for writing, so it doesn't matter that it's old).
Didn't particularly want to clone the old drive (ok, I forgot), so I've been trying to use this method to reinstall tiger using a 10.4.6 disc image.
Ran into several problems, this is a good place to leave the problems and solutions, since it's the top result in google.
1) No USB disc seen when doing dev usb0 ls or dev usb1 ls
USB drives aren't great at being 100% compatible with USB spec, so you run into all sorts of problems with older computers (PC, Mac, Sparcstations, etc).
I had to go through nine different USB thumb drives before I found one that was both recognized (4 of 9 were never seen) and booted all the way (4 of 5 which were recognized never booted correctly).
2) Prohibited symbol
I tried to write the bootable image using an El Capitan machine. The Disk Utility changed from Yosemite and older, and using the "partition" option frequently makes unbootable USB drives. You have to use "Erase" instead to get a working bootable drive to write your disc image to.
3) Eternal loading
Apparently the install CDs don't work if your date resets. When you load OpenFirmware it tells you the current date. When the date is the system default (end of the year, 1969) the boot scripts don't create the /tmp folder correctly, and the installer hangs before it ever opens because it runs out of space.
If you run into an eternal load time, make sure the date is correct. In Open-firmware you set the date using:
decimal dev rtc seconds minutes hours day month year set-time
so for example:
decimal dev rtc 10 24 16 16 11 2015 set-time
sets the date to Nov 16, 2015, 4:24 pm
4) grey screen, nothing visible
The original Tiger install disc doesn't have drivers for the latest ibook or powerbook g4. Buying a retail DVD is a gamble. I bought three and all of them ended up being the original release.
You can find images for the 10.4.6 DVD on PowerPC abandonware sites, and it seems to have drivers for all of the g4 models built into them.
Once those kinks were worked out, however, this method worked beautifully to get everything up and running again.
Thanks for posting this!