Tom,
Measuring from the outboard to the inboard edges of the bottom skin (along the forward edge, just aft of the leading edge) I get 128 inches. Add about 5 inches for the bit of main spar that extends inboard. Measuring from the apex of the leading edge to the aft edge of the outboard top skin I get about 42 inches. Add 12 -13 inches for the aileron width if it matters.
Hope this is useful!