Hey guys; seeing this thread is over three years old (yikes lol), I thought it may not be too late to chime in, because I may have some good news for you guys.
I've recently found BigWorld Engine 2.1, the source code for the server engine, client engine, and "testing engine", the "Indie Edition" and Community Edition, an absolute butt load of documentation on the entire BigWorld Python and C++ library; as well as quite a few, very, very long PDFs vividly explaining how to do this and that. And I'd be not reluctant at all to share this with you.
I'm currently in the proc
