I am trying to understand this tutorial in moi. but I cannot figure out how he laid the curves out to loft the body.

https://hum3d.com/blog/making-of-the-gullwing/

images 2 and 3.

I am not asking anyone to model the car, but maybe just layout 3 or 4 curves so I can understand how its done please.
I mainly want to model classic cars so trying to find what method is best.