Something like...they LOOK like angel and demonic wings, but are mechanical...umm...metallic...the fold inwards with like plates sliding over one another. I can see the images in my head I just have...ok...the cartoon X-Men from the 90's. Archangel, one of Apocolypse's Four Horsemen. His wings. Kind of like that. They didn't just fold up but folded into each other. Each plate sliding in to collapse the wings. I know for CoX it would be hard to do. That's why I think use the models, but make them look more mechanical. Sharp edges. Or maybe show the rivitted joints where the parts come together. I hope that makes sense but I understand if it doesn't.