That's directly at odds with how repair drawings were generally made for one-off repairs to aircraft when I wore overalls.
The drawing office would arrive, just after the basher (sheet metal-worker) had finished riveting up a skin patch, with tracing paper. The repair would then be signed off and published as if the draughtsman had come up with it.
@Jimothey - Si's suggestion is sound. In a few years time, after Rickenbugger's lawyers have taken down BC for looking sideways at one of their genuine basses once, people will believe that you designed everything and built from the drawing board.