Not sure about the Scania cab being bigger? You could do an aerobic workout in the XXL MAN if you were that way inclined. I’m sure you would injure yourself trying to do the same in a Scania. However, you can stick loads of lights on the Scania, half drawer the side curtains so all you see is a pair of arms driving and buy lots of shiny bits off ebay for it.
Ultimately its what works for you