A friend, whose doctor daughter, who has just finished putting a Caterham driver back together after a Caterham - Tree interaction, commented that the crumple zone in a Caterham is the driver/passenger pelvic area!
Having owned numerous Sevens since my first in 1986, I can only be thankful that I didn't buy one in my late teens and early twenties. The best I could do then was a race tuned Frogeye - which didn't get away unscathed, due to complete silliness on my part, but at least I was OK each time, due to lower speed and more metal around me.