That's an awesome rock machine ! I built a Precision Guitar Kits " '59 carved top" and, like you, used Tru-Oil for the ease of application. I was stumped as to what to put on my headstock too, so I had a guy make a little vinyl decal just for temporary purposes, and two years later it's still there . . .
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PS - sorry for the sideways pics ; they don't display that way on my computer