I have a mini-itx system running XP that boots entirely into Workbench. Never see Windows at all. See the pdf below for the guide I used. I am extremely happy with the system I threw together and configured based on that guide, it runs flawlessly and faster/more reliably than any real Amiga I ever owned. Outside of a stripped XP install, all it really needs is roms and WinUAE. Below link mirror courtesy of Zac67, iirc.
http://wowohl.de/Amiga_XP_x86.pdf
