I'll get more accurate with the wing area. The way I'll do it is how the model airplane manufactures have done it for years. They take what the root would be at the CENTER OF THE FUSELAGE (for comparison only, on a full scale they don't count what is under the fuselage), (root + tip) ÷ 2 x wing span. 24.5 + 11.5 = 36 ÷ 2 = 18 x 103.5 = 1863 sq in. Why Model manufactures use the center on a low wing or mid wing planes I don't know but they all do [:@]. My wing is ½" longer then standard. The reason I mention fuselage width being used for wing area being misleading is what if you had a 24" wide fuselage? Your usable wing area would be greatly reduced.