Since the good Doctors are done explaining how it should be done in
the electronic world, here is a bit of advice for you to ponder,
Larry.

It was good enough for NACA to have the leading edge be above and
ahead of the origin of the coordinates system (Remember, Aero
specialists. Leading edge radius and slope on the old sections, hmm?)
Spline it that way, from upper surface to lower surface, right on
around the old leading edge. Use a point at 0,0. See how far above
and ahead the "actual" leading edge is in percent. Then, look at how
much this is on the 36 inch or so root chord of your wing. And then
look at it on the 14 or so inch tip chord.

You could mislocate a template by twice that much if they only go as
far back as you showed in your drawing!

Get it close and make it as smooth as possible. If only it was as
easy to smooth a wing (and maintain the desired contour) as it is to
smooth a curve to give a desired pressure distribution in the world of
electronics!

BTW, I spent hours smoothing the 67K150 section coordinates. Making
changes at the thrid and fourth decimal point. Made HUGE changes in
the plot of spline curvature. When looked at on the wing sized
templates, less than .001 inches.

Steve Leonard