There is too much overlap (almost half, when a maximum of a third will do). As I remember this was due to deliberate framing of top and bottom rather than over-cautiousness. But, as it's always, its best to cover more than is judged necessary to allow for cropping after stitching, I had plenty in hand to have taken more. A little more at the base would have been good.

Notice the lightest in the centre of the upper half where shooting directly up at the sky reveals lens flare. This has been compensated for with an extra appllication of Local Contrast Enhancement to the area in Photoshop. Not what it's intended for, but a simple and effective solution.

the combined image before cropping

The lower half was shot first. The top half being offset to the left strongly suggests viewfinder inaccuracy (photographer carelessness?) due to taking the camera from the eye to wind-on the film.

Also note the losses top and bottom due to cropping from the spherical merge resulting in not me getting the framing I expected. Moral with panoramas: always shoot wider than your intended composition.