Thanks, first time I've heard of them, will be going through those (they seem to be available at archive.org [0]) soon!
I'd like to point out another interesting 18-part series of videos about prototyping (in his words "a short course on how to build stuff" :)), by engineer/inventor/professor Dan Gelbart: [1]
[0] https://archive.org/details/GingeryMetalWorkingShop/mode/2up