John, the rear elements of armor are meant to be folded down when the missile is fired. There is a great video of a TOW being fired from a Maxxpro where it blows some part of the vehicle off the roof as the middle leave the tube. It might be some sort of conduit or something. I've done a ton of research on the web and this model looks dead on. I bought most of these parts from Peter Samofalov from his Shapeways store. He did his research well.
Regards,
Eric