If one foot on the model represents 70 feet on the real object, the scale is 1:70. That scale applies to all dimensions and units. In other words, you can divide any object dimension by 70 to find the corresponding model dimension in the same units.
model tail height = 392 inches / 70 = 5.6 inches
model wing span = 2537 inches / 70 ≈ 36.2 inches
model length = 2785 inches / 70 ≈ 39.8 inches