I think it would be a really good idea if as well as being able to change the liveries of trains in TSW you could also create your own interior. You could change the seat Moquett to a design that you make or a preset one similar to Bus Simulator 21. There could be 2 different seating variants one for first class and one for standard class and you could change if you want the seat found on the train you are customising or if you want to pick another seat design.
