Awesome. I've been dying to try A/UX for years. My only mac that could run A/UX died a few years ago. Getting ridiculously old computers and operating systems running is a fun hobby.
"Requires a Macintosh II, IIx or IIcx ROM, and a disk image with A/UX installed".
That's kind of a tall order.
Fun. Back in the very distant past I worked on a B-level secure version of A/UX. Honestly, A/UX was a pretty awful mishmash of crufty old SVR2, some BSD chunks and a smattering of SVR3.