The 2CV’s boot is spacious but the floor isn’t very flat which makes it a bit impractical to use.
To improve this I’ve added a boot floor. This is a piece of 680mm x 940mm plywood with a notch cut in the back edge to fit round the central support for the back seats and a couple of notches in the front corners to allow it to slide forward through the boot opening thus allowing the back edge to clear the back seat and lift out. There’s also a small block of wood glued and screwed into the middle of the front edge to stop it sliding forward.
With the basic shape fitted I covered it with some bluegrey automotive carpet which provides a nice usable boot floor and the tools and spare wheel live happily under it and out of the way.