ToastyRides -- Guy in Auckland NZ, compelled to clean up vintage mtbs in his little garage workshop. Practical, knows when to say "that's good enough". Usually has some test ride footage, mild stuff, but the scenery makes me jelly.
youtube.com/watch?v=MlTrnbZFaU4Paul Brodie -- Old school mtb framebuilder in PNW Canada, making machining videos with careful explanations. Paired up with a good cameraman. Niche content, but excellent.
youtube.com/watch?v=4qUuQZHIjmw