Tesla is vertically integrated into producing most of the electronics (including the engine) in the car and in the charging networks. They also design products to be manufactured efficiently.
This suggests that they should be able to mass produce actuators and put those robots together efficiently. Musk looks at mass manufacture as part of the product development. However in the end this relies on enough demand being out-there so that its worth continuing the scale up of manufacturing lines.
It will likely take a many more iteration for this to be more then a tech demo.