I have a great book: "Building Aeroplanes for 'Those Magnificent Men'", written by Air Commodore Allen H. Wheeler, C.B.E. 1965. G.T. Foulis & Co. Ltd. London
It describes the design and construction of those flying (and non-flying) planes used in the movie. Lots of details, photos, and anecdotes of problems getting them to actually fly!
For instance, the "Demosielle" wouldn't get off the ground until they found a small female pilot Joan Hughes, weighing "8 stone" (whatever that is).
The Antoinette would stall at just a couple knots under maximum flying speed!
Floyd