Short short clips, but the footage [shown here in an episode of the Discovery Channel’s now-defunct SFX program “Movie Magic”] is vintage GBII Behind The Scenes of Rick Lazzarini showing off the “Waldo” rig, and the underskull to the Theater Ghost [aka “Six Eyes” in all the merch]…The pertenant scenes are at 10:57 and 11:28:
wow, thanks for the video 
“They found what they were looking for in L200, a very light polyurethane foam used in the aerospace industry which handles like a flexible foam core” …
Whoa…
We need some of that L200 … or at least I do.
Movie Magic used to be one of my two favorite shows.
Dude! I LOVED that show! I used to watch it all the time!
You’re kidding me. Oh, great. What was the other one?
Bassmasters…