One can't miss how finely tuned his plane had to be to cut that finely & evenly. But for the fret cuts I'd lean toward scrapers, but a scraper plane might grab at the cuts. He spoke of using a block plane, and that probably a low angle. The use of a 5 seems to me odd but seeing it work makes sense. a 5 1/2 might cover the whole surface. I'd be tempted to a lower angle, like the Lie 164 or similar. But then I'm no luthier. Nor am I going to use my 2E as a guinea pig.