KR2S Wings under construction.  I  used the standard RAF 48 airfoil and used the washout and wing incident per  the plans.  These are scratch built using Styrofoam.  I do not plan to put any fuel in the wings.

Wing Construction

Top right wing,  the wing is  already glassed from the forward spar back. The foam is microed in place forward of the main spar. I then used an 8' long 2"x2" aluminum angle with 80 grit sand paper as my
sanding device.

Wing tips are just 3 layers of 2" Styrofoam  for a total of 6 inches extension of each wing. I didn't get too
elaborate with the tip,  just sanding the edges  to a get a round  aerodynamic structure.