I guess if flybug holds the tip chord to about 4.5" and chooses 3/16x 3x16 balsa for the spars, and 3/32 for the ribs, he'll have a nice wing. You don't have to fully shear web between the spars, but a 1/2 inch wide strip of scrap 3/32" balsa adjacent to each inboard rib, spanning from the top to bottom spar goes a long way to strengthen the frame work, will keep the inner ribs from buckling during those high G pull outs. Oh, round off the root chord dimension to 6 inches [instead of 5.8757245"] too, this is carpentry, not machine work
!!