AFAIK there is no way to follow instructions from somewhere that results in an actual working system. I think there's something experimental that works on top of a Smalltalk system, but that it's not able to work independently of that. I also don't remember all source code being available.

Oberon is able to run on actual hardware and works in various emulators.

I do love the research they did for STEPS though, it's unfortunate it didn't result into an actual release.