regarding your structure, have a look here: https://en.wikipedia.org/wiki/Porsche#Production_and_sales. You get some good ideas about how to structure when looking at the numbers. Generally, car manufacturers' production output is mainly a function of demand. Also, keep in mind that Porsche cars are high-priced cars, so not everyone is able to afford one.
Aspects would thus be:
- Countries of production (infrastructure could be important: railways and roads, to transport cars; tax, etc.)
- Demand (from where?, how much?, segments?, market size? price willing to pay? want premium upgrades? want service maintenance contract?, etc.)
- Throughput and lead time (production time? needed staff? cost of staff, management? where head office? robots and other tools?)
- Risks of production (competitors steal customers? Ferrari? Lamborghini? AMG? where are they and does Porsche need to open a new facility there quickly to avoid potential customers buying from the competition? speed of production high enough?)