The back of 1-series is definitely designed for legless. There is not much space at all. It is a very small car, yet it somehow weights 1,5 tons!
With an engine like this it would go like a true rocketship if it was 1,1 - 1,2 ton range where small cars used to be.
BMWexpert, I think you would gladly buy a plate of sick if only it had a BMW badge on it (as seen in TopGear)