Not the OP, but I've been teaching along similar lines. I've done it a couple of times at conferences—here's one of the versions: https://www.youtube.com/watch?v=8Q-frNO-yps

I've also blogged about it

- https://looselytyped.com/blog/2014/08/31/gits-guts-part-i/

- https://looselytyped.com/blog/2014/10/31/gits-guts-part-ii/