Back in the day there were hardware specifications of a potential notebook on this website. Where have they gone?
About an AmigaOS port and before talking prototype, amiga friendly hardware could be discussed with experienced companies such a A-Cube systems (
http://www.acube-systems.biz/ but i'm pretty sure you already know them), A-Eon is a bit focussed on its AmigaOne X5000 for the moment but as Amigaholics they are always open to discuss such serious project.
From what I know about such a project related to AmigaOS 4 is that full hardware documentation is needed, not just a linux driver.
Is there still many interest in a new PPC notebook from linux users? I thought they were focused on X86 and ARM for mobile hardware.
Anyway I'm sure that the Amiga community could be interested in this project.