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Some interesting info on the development of Model S from above link:
The external design of the Model S has been finalized with the creation by the engineering team of a full vehicle 3D CAD package refined to typically +/- 5 mm. This level of precision has enabled the release of design to external parts suppliers.
Most long lead items have already been sourced, including the 17” touch screen, instrument panel, seating, mechanical restraints, lighting systems, suspension, brakes, cells, HVAC, wheels and tires.