Daox
The 2cv has several good things going for it , I can use the chassis only slightly modified for about 80% of the car , it is compact and easy to work on [ simple !].
There is a manual here about building trikes and does recommend car engines over bike engines if possible :-
http://www.btinternet.com/~jhpart/books.htm
I hope to build it as a trike first and then clothe it.
Paul