Could you make these new cars work with Interactive Vehicle Support? This isn't a request, it's a question of whether it would be possible.
I've always liked your cars, but they have always just been solid, never changing shapes. Then, you added a working steering wheel, and that was cool. But I've always felt like your vehicles needed more interactiveness, such as convertible roofs, working brake lights, etc. Now that your cars will have parts that can be added, you could also include toggles to enable/disable convertibility for the roof, enable/disable brake lights to work, enable/disable steering wheel turning, etc.
I tried, one day, using the ChangeVehicle output event, which allows the user to change the type of vehicle while it is being driven without dismounting the riders, zone bricks, and your Zenoz variants to create the illusion that it had a convertible roof. It worked very well, and looked fantastic.