Nice article with some good, hard numbers.
The thing I found interesting is that the main production facility may not be the limiting factor as far as capcity goes, rather it is the parts suppliers. I know that smartville is in fact a campus that include not just the factory, but smaller units for every last parts supplier. This model is supposed to be very efficient in terms of delivering the necessary parts just in time, but it seems it can limit the flexibility in adjusting overall production rates to meet demand.