Thanks. I think I'm going to try working with this locally loaned Lisa for now, and see how far I can get. People are popping up everywhere offering to lend me stuff, which is really nice.

I totally agree a Lisa HD emulator (widget or profile) would be more exciting than a Lisa floppy emulator. I'm only looking at Lisa floppy emulation because of my hope that it will be "easy" to extend my existing design, requiring just some small firmware changes. And there's already the X/Profile, which sounds like it fills the emulation need for Lisa hard drives. I guess I'm just going where curiosity and expedience take me with this one.

I did stumble across LisaEm while I was searching for info, and I'll definitely take a closer look at it.

According to a commenter on my blog, the floppy hardware is different between the Lisa 2/5 and 2/10, and only the 2/10 has an IWM chip. So that might be something to begin my investigation with.