Mounted the speakers in the central support structure (CSS). Also built the bubble lifter motor mount. I'm using the same motors I use for the hip and torso rotation instead of a linear actuator. I made and attached an off center cam and get about 3" of travel from it. As the cam turns it forces the neck shaft (which attaches to my neck bracket) up a guide tube (not mounted yet). You can see the top of the cam in the above picture, sticking out from the top of the torso into the collar area.
Here's some more pics: