So, after some tinkering and a can of Red Bull, I gave Cannon Bumblebee his wings! They rotate about 45 degrees. It's not quite as "stable" as my previous chest mod, hence the lack of a tutorial. I also added some additional chest pieces that sit behind the front chest pieces to help fill things out. Basically, the way it works is that I rounded off the edges of the bar in the back, tightened up the sides of the front fascia, and let the head/hood assembly rest in the crack. It still needs some work, but it looks much, much better. Post if you've got questions, and I'll answer them as best I can.