Could I stop you if I wanted to?

BTW, Tamiya missed the entire mechanism for folding the canvas roof. If you're going to add the canvas, you may want to also add the bars that allow it to fold and unfold (which I didn't, because I wanted this to be a quick model, not too involved). I found a forum with lots of pictures of the Simca 5 (and 6 and 8) when building my model. Since the only substantial difference between a Fiat Topolino and a Simca 5 is the grille and badge, I suppose these could prove useful for your model too.