Just a guess - but I would think the VIN is applied as a step close to the end of the line - which means all the painting and most of the assembly is already completed. Either that or some numbers for critical parts (provided there are matching numbers for VIN - not sure about the VX but I know some other manufacturers do so) are applied early and then brought together towards the end during assembly. Since there's a handmade aspect I doubt that they worried too much about any sequence, but rather towards total production numbers as a per-day, per-week or per-month datum.

-- John