Dammy,
I have never had the chance to look at the AROS internals although I am familiar with the effort from the beginning. I have been associated with the Amiga from 1987.
I am a trained Assembly language, c, c++, and Java programmer with 24 years experience.
I have a PPC design that can use Amiga OS 4 with little or no porting needed.
The AMD might be better with AROS but that is something I cannot comment on without being familiar with the internals.
I also have an alternative OS that is even smaller, faster and lighter than OS 4 or AROS.
Embedded developers know it well. They already finished an AMiga port some years ago. That is all I will say at this point. You can research it and you will know who it is.
Kathyone