I like to put "people" into my cars, and this Cadillac looks like it's
handling four very well indeed. It is accomplished usually by opening the interior (taking the body off the base and esposing the seats) and then using train waiting-room figures; these are readily available and are usually o scale/ 1:48. Real people come in different scales, too!
When the model is closed, feet, legs, and rear ends are not seen, and these are easily shortened, clipped, or otherwise shrunk to fit. This eventually turns into fun! (But it's a lot easier just to use standing figures outside the car.) I like the results with this Cadillac. I think I'll try a sedan sometimes soon.