I have to tell you it IS sharing the same platform,economies of scale,the next 7 models are,its whats clothing them that will make the difference!It would be a shame if it did share the very same platform as this would limit the scope for a smaller package which I feel this car would need. However, I don't really know what Carbotec's process is. Any additional costs making a new mould may well prove uneconomic.
You forget the tub in itself is just dimensionally big enough for two people,its how you cloth it that gives it width and length!!