On my wing, the orange piece (coroplaste 4" wide) on top of the wing, wraps around the wing and extends approximately 2.5" on the under side, both LE and TE. This supports the front and rear of the wing against the fuselage. The wing may not sit exactly parallel (LE and TE) to the fuselage, but it's so close you can't see it with the naked eye. In your diagram your wing is diamond shaped, mine is a little more rounded, both top and bottom.