Hi and thank you all for looking and commenting. SteveV, I apologize for failing to answer your question. I don't use a pencil to outline these really intricate designs because the pencil point cannot reach into the tight corners. I use my pointed carving knife or the outlining/stabbing chisel I showed.
I mentioned that my first use of the plate was on a Chambers fowler kit for which I had to eventually discard the stock because it was ruined by the previous owner beyond my capacity or desire to cope with. The inlet for the trigger guard was the problem and there was no excess stock left to maneuver around. Anyway, I thought I would repost these photos that might inspire others to modify their kits. The fowler had a generic solid English side plate already inlet. I wanted to upgrade it with my plate so the first task was to fill the mortis with a piece of English walnut.
Using the old plate as a template, I cut some walnut to shape and inlet it into the existing mortise.
Then I proceeded to inlet the new plate knowing it would obscure any lines of the old plate and you would never know I filled the old mortise.
Hopefully, this gives some of you folks food for thought about how you might modify kit guns and perhaps, fix mistakes.
dave