I am working on mod and prop version of the cars.

amazing.Maybe you should do Centerbeam cars, too.

I would nice if we could get the cars inside as a prop mod it self

hmm nice

I did not add that ability but you can remove them in Blender, all parts are separated. you could also remove the doors by deleting the light effects when making your own liveries.

Is there an Option to be able to remove the Roof and doors?

YES!!!

Very nice.

YIPEE YIPEE

Nice!!