Maybe I'm wrong but Mitsubishi, for instance, looks kind of painted to me. I guess some (not all) VGT designers never really bothered to develop any interior concept at all. In car design it seems to be two separate teams: one creating interior and the other doing the outside looks.
I find it weird that PD would have to design VGTs interiors without any digital data, either from CAD or from laser scan. Some of theses VGTs have real-size counterparts, but others don't. If you don't have neither the digital data nor physical one, can you actually do whatever you want without permission? And even if PD were allowed to, it's not their job to design cars for other companies (except in a project of their own, like the RBX), they just get cars created by others, from all over the world, and put them inside a video game.
Mercedes-Benz team created an interior, there are beautiful 2D paintings on the web, but question is: that real-size model that was built has a fully detailed interior, including fabric, leather, plastic, colors and so on? Or is it just a fake wheel, two regular seats and a basic console, with tinted glass to hide it's lack in details? I've never seen that car with open doors and I would really like to. Is there CAD for that interior?
A couple of cars have interior, both roadsters. Is it because PD guys were not too "lazy" concerning these two specific ones? Because they would look strange with that black cardboard, being no top cars? Or because data was sento to them to work with? I don't know.