Now to the A side (upper).
Starting with the Mills level (where viewing platform and the 1925 mill are) the incline going up from there is A5 however, you have it going up one level too high. It only goes up to the level where the first sharp hairpin in the track is.
Above that you have shown several inclines which are not split/joined quite how you show them. The next incline upwards is A6. The first level up on that incline has a loco shed to NW marked as a building on your map. That is Level A6A Penrhydd Bach. A6 continues up a further four levels, A6B, A6C, A6D and A6T. you can clearly see the drumhouse on sat photo. There is a largish building shown on that level.
Going higher still, you have A7 incline, correctly shown by you as going up two levels, A7A and A7T. The first incline you have marked to SE of that is "Old A7" not sure what the small one further SE is.
Going higher still, the next incline you have marked as two separate inclines is one, A8, serving A8A and A8T.
There is yet another short incline just visible on sat photo to E of C8's head that goes up in a due E direction, that is A9, serving just one level, A9T.