What a delightful coincidence! I just posted the next chapter on my in-progress book "Crafting Interpreters" which walks you through implementing an interpreter (well, two actually) from scratch, a chapter at a time:
I can really recommend this book, I've worked through it and am implementing the interpreter in Rust. I've just finished the latest chapter and am looking forward to the future instalments.
Thank you for the tutorial. I've scoured the Internet for lighter introductions to interpreter development, and yours is the only one that's worthwhile. Great job!
http://www.craftinginterpreters.com/
I really liked "Build Your Own Lisp" too. Fun book. :)