But, but, but, Aros-MAX, I thought that was an extension to Windows???
That can happen if you don't check!!!
Is it hard to program an OS to run on specific hardware?
No. But then again it takes years. It's not like you can just get 10 people from some forum and get the os ready in two weeks.
10 years is somewhat realistic timeframe for a hobby project to get somewhat usable as OS of it's own. Less if you can recruit lot of skilled people behind it. A lot more if just ignore any previous work (such as linux or bsd, or amigaos) and want everything your own, designed from bottom up.
Another problem is lack of applications, that can kill any otherwise nice project.
Anyway, sorry I'm already occupied with "OS of my own". ;-)