>For the car door, would it be possible to persuade the forward portion of a P-39 or P-63 canopy to fit?<
The P-39 not only has a curved clear piece front-to-back, but the entire door is relatively uniformly curved, like a parenthesis....( The Hawker "car doors" are shaped more like the Spanish pre-question mark, that is, a straight and squarish window panel (clear) on top of a curvy door....¿ Shown below is a photo and drawing of the "car-door" Typhoon. I now see that the "door" is very short, that is, it does not go all the way down to the floor of the cockpit. More like the flaps on Hurricane and Spitfire cockpits, but with some of the canopy window attached. The one on my Henley is going all the way down. Hmmm.

>Enjoying this progress.<
So am I! This project is complex enough to test and challenge my skills, but I am enjoying the progress, too!
I have the tail (vertical and horizontals) on, and am now turning to the wings. The complexity here is that a mating of the Heller Tempest and Hurricane wings is fairly straight-forward *IF* I didn't want to show off some hole-ly dive brakes a la Douglas Dauntless (or Brewster Buccaneer, where they came from, and, incidentally fit the Henley to a "T"). Substituting the holed flaps means having to add structure to the center inside of the wing to keep the proper thickness during the substitution. Too bad, because the Hurri and Tempy's wings go together so nicely!