Looks like a lovely car. All the important and hard to find S1 parts are present (push button doors, instruments, seats, etc.). And it seems to be a largely unmolested/unmodified car - very valuable. The chassis has to be checked and, as said before, most probably needs to be separated from the car to fix it.
I think the S1B is the least attractive one of the S1 variants as it has lost the beautiful Carello tail lights. But the price seems to be about right or might even be on the cheap side. And every S1 Europa is such a rare and lovely car.