Not yet. I'm willing to pay for stuff like this. I was reading Tim's Rust in Action at that time and I liked the book so when he announced that he was starting such a course I immediately singed up, although the price was a bit crazy. I got the coupon code from a guy on Reddit so that's pure luck. I am really willing to pay for other peoples IP. I am still hoping that one day he could complete the project but before that I've got some other projects to work on.

Side note: I've finished Build your own Redis in C/C++ (https://leanpub.com/build_your_own_redis) and it's pretty decent. The title of the book is a bit weird since it's almost 100% C++ so I don't know why they put "C" in there. But it's a pretty decent book (and reasonably priced).