Oh wow, that be the coolest thing ever to have a reading group for this book, which is also at the intersection of multiple of my interests, and I've had my eye on it for years. I want to learn classical mechanics at a much deeper conceptual level, and I want to absorb new, powerful uses of Lisp abstraction, and writing toy physics simulations is of course always fun. I have so many bits and pieces of weekend projects that sort-of lead into SICM, and things like it. Sadly, I'm temporarily on the wrong continent for Bay Area meetup groups. (Maybe this is an error state).
I hope you serendipitously manage to find your ideal reading group, nanomonkey.