Terry, someone over in one of the Duncan forums discovered that his cheap Epi SG is made out of fiberboard. I was trying to remember the name of the guitar Gibson made that was made out of fiberboard. Finally came to me this morning. The Gibson Sonex, and they called their fiberboard "Resonex", but I guess what they had was a real wood core, with fiberboard laminated to that from what I can tell.
But it kind of reminded me of your Utahcaster. What ever happened to that?
Here's a webpage on the Sonex:
http://www.vintageguitars.org.uk/sonex.php
There're several of them on ebay, and they're asking insane amounts of money for them, claiming that they're rare.
Pete