IIRC, Bob Hunt said the airfoil as wrong on the FM plans for Bill Simon's Shoestring. Again, IIRC, Bob said he cut the wing cores for the original.
Incorrect airfoils, and other things, were not uncommon on published planes back then.
Champione Lampione's NATS winng Sabre was a foam wing planes (actually the first foam wing to win the Walker Trophy) and it was drawn as a D tube wing.