Hey Mike,
Great to hear from you, and thanks for the clarifications. It turns out that I’ve already been in touch with Michael Glatzhofer because I found his work on GitHub, but didn’t realize he was here. So I’ll get back in touch with him and check his availability.
incidentally, the programmer who did our quite excellent Flash-based tree in the early 2000s was Jared Tarbell, whose work you know because you have a fork of his Substrate here on Observable.
Thanks!