Sliding offtopic, but do you have any more memories around this specific collaboration? I'm deeply familiar with the theory, but anecdotes on such an ambitious project would be useful to a text I'm working on. Thanks.
I provided Chaim Gingold with a bunch of emails and code as material for his dissertation, which he analyzed, wrote about, and quoted in the sections about SimCity. He also interviewed other people who told sides of the story I had not yet heard.
Please send me an email (contact in my profile) and describe what you're interested in, and I'd be glad to answer questions, dig stuff up, and forward it to you.
His dissertation is long and detailed (as those things tend to be) but well worth checking out! Especially all the great stuff about Doreen Nelson's lifelong work.
I don't have a direct pdf link, but if you prod and jiggle it a little bit, this pdf viewer will let you download the entire pdf:
PhD in CS dissertation on "Play Design" by Chaim Gingold, June 2016, UCSC.