Hey Thibaud, there are two photos in your post that are worthy of "Photo of the Day", and here is one of them. Wow, nice composition, and great subject matter! Cool!
Every now and then we see a Citroen 2CV running around Nashville. They're very rare, but I do recall seeing one within the last year. As for your prep of the hull, the prep is most of the work of the repainting job, just like an auto. I can see you are filling all the holes drilled in the past, etc. Excellent job!
Regards,
Paul