Where did this project get to? My first ever car was bought in Belgium, the basic 2CV with bench front seat and a roll back roof (no fancy levers to do it from inside). It was that, or the Llada, which was even cheaper. I know it is a bit premature, with Chris at Tribute about to start my Z3gato. However, I am thinking about a project to start later next year.
Currently it would be a Lambretta LI150 refurbishment from wreck to refurbished wreck. (Seriously, as a 16/17 year old, I did just about everything mechanical on a scooter. This was way, way back in the late 60s.)
But a 2CV based 3 wheeler, wahay!