There are not that many variations of the zs ev, 3 models and 4 colours its not exactly loaded with customer specific additions for a particular build. I would imagine they are batch produced. There is no reason that I can see why a dealership would not allocate a vehicle to a customer order if it fits model and colour. I have ordered a Trophy in black or white not that fussed. The dealer has said whatever arrives first he will let me know. All this business of customer cars not yet built or cars arriving that haven't been built. I don't see how it works like that on batch production. From what I've seen they appear to do a run of lr or a run of Sr. and colour. I certainly don't think they are built as individual customer specific orders. They probably look at the overall range type and colour and batch produce but that is about as specific as it gets. That's how they keep the cost down. It's all costed logistics at the end of the day.
Of course if anyone know otherwise, I bow to their knowledge and stand corrected as I have been known to be wrong in the past. But only once.