A “tutorial” on engine modification is kind of a complex thing to do; engine modification is generally considered to be a fairly complex and “advanced” thing in general, so it’d be difficult to write a full tutorial on engine modification for all types of users. That said, I recently tried to make the source code side of things a bit more well-documented with page: .simul.co/unrealengine/Source.html. I’ve only done a first-pass on it, so if you want more detail on any particular aspect, just say what and I can look into it.
Also what stability issues are you having? I just mentioned in a private message from someone in the thread , but I’ve been using as a customer (and I like it so much that it’s why I’m working with on making it more accessible) for over two years and while there were some bumps in the road a year and a half or so ago, I’ve had nothing but consistent results, performance, and stability with it 95% of the time. If you’re having stability/compatibility issues, those need to be identified with specifics so that we can look into getting them resolved.