I've been bragging about how crucial the low weight is for the car dynamics and fuel economy, hence emissions, but if the intention is to build a car one can use with the minimum level of comfort outside the track and even on a daily basis that low weight can't be achieved at the expense of the essential car interior features and functionality. The Alfa Romeo 4C I think is at the very minimum of what is acceptable and enough to take it clearly apart from what make the Lotus useless outside the track: