Your system certainly looks easier than the chart tape route to make the panel lines. But could you clarify a couple of things, since I have not tried either as of yet, and I'm not really familiar with types of scribes.
I browsed the web and found some different scribes, based on their industry (machinist's, pocket scribers, needle scribers). Could you provide a more detailed explanation of the scribes you've tried? Also, the way it's written, you use carbide straight scribes as well as dental picks. Is this for being able to make various thicknesses of panel lines?
You also mention about ''fine tuning'' the scribes. What did that consist of, and the reasons for doing it?
Lastly, I guess it might be understood, but this detailing is done on the very final coat of primer, correct? Once completely done, and degreased again, it's time for the paint, with no more primer on top of the new lines and rivets?