back to the original question. My understanding is yes, Lotus did much of the work, and they often do design for others. I remember an interview with CEO Gales ~2014, he mentioned that the CF tub of the Alpha only saved a few kilos over the aluminum tub but was much more expensive, so lotus chose to stay with that. But I don't know of anything explicitly saying they designed it.I remember reading (probably in these forums) that Lotus was officially involved in the preliminary design of the Alfa Romeo 4C based on the Elise. Then Alfa Romeo and Lotus decided to split apart and Alfa Romeo continued on their own to production. Is this true? I cannot find this information anywhere.