Hi radon_22, yeah I mentioned your project in my opening post. I remember reading about it in the past.
The thing is, with BartPE you can use PE builder can't you and let the end user add the copyright files? We just need to customize it for WinUAE. I'm sure we could think of something.
As for Linux, the weakness there is UAE or E-UAE. It has to be WinUAE, it's just the best!
Someone already started a Linux project:
plus there are other solutions around the net too using Linux including the Amigaforever CD.
As for Windows XP Embedded - if some one could use that then great!