As I see the problem with OSX on the 1400 is its memory foot print. OSX wants 256Megs of RAM minimum, you could get by with 128 but its slow as a snail stuck in molasses going up hill on a cold day. The 1400's max memory size is 64megs, so from that alone, it is not going to happen without major headaches, as I seen on I think on EveryMac.com. And that is just the start of the headaches. So would it even be worth it to do on a 1400? No. It would not unless you want followers of the Cult of the Dead Cow bowing at your feet chanting "We're Not Worthy..."

But as for it being impossible, I do not think so. My many years as a programmer tells me that it's doable. But with all these headaches, is it worth it. It is not. Years ago (around '05 or so) I remember the PPC BSD Unix branch getting a Nubus Mac to boot its Unix along with the Mac GUI - Evolution (I believe it is), and boot a few PPC OSX Mac applications. OSX is based on BSD, so this is possible then, and it is now. But interest in it fall so the project was set to some side burner to stay warm and forgotten about. I have not heard from this every since '06.