Photo: Bloop 2 leading edge construction. These blocks of blue Styrofoam are attached between the ribs with epoxy glue, then shaved down to the rib contour with a hand tool (Surform shaver).  A lot of this foam is going to end up on the floor (it's a big mess!) . Filling and sanding will later create a smooth curved surface. This leading edge shell is non-structural, it just holds the airfoil shape at the front of the wing.
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