... yes, that is possible, and it's even easy if you know how - code-words are: yaboot, initrd, enet:. That's pretty much it.
Danish keyboard took some tweaking (there's only German and French keymaps supplied for Mac keyboards), but no big thing.
Outstanding issues are:
- Video at more than 8-bit
I have tried some stuff with the colours, but no success yet. Sound is at the lowest priority, so I haven't even tried whether it works or not.
Funny how a 300MHz PowerPC feels faster than a 400MHz Celeron. I've never tried a portable that felt quicker than a stationary box before. I could get used to that...