hmmmm interesting... both kits i've built so far after getting back into it (tower trainer .40 and four star .40) state to put the web "between" the spar I-beam style. My gliders in the past as well called for this. Attaching to front would be much easier and I will start doing that as the webbing is the part I really don't care when building wings. Cut, test, adjust, cut, test, adjust, and on and on for each one.
Mike