I went down this track and plotted the equation for the 0040 airfoil below:
I tried to get it to scale as best I could on screen with a ruler, 300mm long and 60mm high at apex.
It fits the 2.5:1 ratio, has Apex to tail ratio of 1.7729.....
Could someone try to overlay it on the template, I haven't done that yet, too busy playing with the numbers.
The plot was done with 110 data (extra 10 on nose to get nice curve) points, but I could easily go more.
The equation does not go to 0 at tail, but there is some additional stuff to add to the equation to fix this, just thought I'd post this up now.