There are ways to make a Titan Ark scale even with the larger figures. It just wouldn't work for ship mode as it would need to fold out and you'd have to let go of the idea that it would accommodate ceilings and such. Again, I mention the GIJoe Pit as an example. The walls along the "wings" could work for Teletran in one area and a med bay in the other for Transformers up to leader class. Same with the top section, since it's open air. You have a walkway behind the elevator and cockpits for core class like Rattrap or that Bumblebee and Spike set. I'm not saying the Ark would be exactly like this. But it's definitely an example of what could have been versus just another giant robot.