>> ...except some older PowerBook G4 Titanium and eMac models.

> http://www.geit.de/images/hm12072013/images/img_0010.jpg
> http://www.geit.de/images/hm12072013/images/img_0011.jpg
> For the Titanium Books there also exists a tech demo.

"Older PowerBook G4 Titanium" as in PowerBook3,3 and PowerBook3,4. I'm well aware that PowerBook3,5 is (kind of) supported since MorphOS 3.4:

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=8874&start=27