I think you did an excellent job on these diagrams and explanations.
That said, there is an entire subculture and nomenclature for loading LFWC, LDEWC, etc. To be frank, I wouldn't waste my time, if I were you. In this context, shoulder, neck, and mouth have slightly different meanings. Crimping is also different, in that it usually refers to rolling the edge (mouth) of the .38 case over the entire external diameter of the LFWC where it meets the case mouth.
@25-30 years ago, we used to load 100 gr. (or even lighter) LFWC bullets in .38 Special in order to practice with the trigger. This was when you could buy 1,000 WSP primers for $9.99 or less. Needless to say, I haven't known of anyone doing this in the 21st century...