Thanks for the response. It looks like an excellent build.

I vectorized your drawing with the same procedures I used before.and got the same thing. The drawings of the wing and stab were meant for reference only, not to be built
over like a stick built model. If the vendor provided cores were symmetrical it wouldn't show up in the real world. It could cause a problem if you ever needed to make a new part from the full size templates.

It was good to confirm this issue from another drawing. Just a quirk leftover from the bad old days.

Thanks for looking.

MarkD