Good stuff George.
You might find that the curve, and 'tight' space of the flap hinge line is a bit too much for strips of decal to handle, as one decal strip might disrupt the next, when trying to settle. I normally just paint the white rectangle, then, when dry, draw in the lines with a fine pencil, sometimes with a fine lining brush and thinned black paint. Any lack of density or 'solid' appearance in the lines looks just like normal wear and tear and natural weathering, and is more than passable in this scale.