And I forgot to mention, I am using the ROM file that was inside a .bin, which is the one I think before the latest.
I think you have the correct one, the one from post 143?
I was able to get to the desktop on my PowerBook6,8 with that one, but the finder never started, tho the system stayed running.
One the Mac mini it should get you to the desktop, but the system won't be usable at all, as there is no USB.
Make sure you are booting with no extensions in the extension folder.
I think we're all in the same boat here, waiting on a valid :tbxi before we can do much else.