Well, technically aluminum would be the lightest. I'm not sure exactly how many of these were made, but there was a run in '92 or so of aniversery strats and teles. I think all in the guitars were just a bit over 6 pounds, but I'm not sure if there were various neck options. I never played one but i think they look really coo. they did a good job with paints to take advantage of the possibilities of the surface material.
When I saw this, I did a quick search to see what's out there for sale. I saw a couple for sale to see what these sell for, I remember checking them out about a year ago. One thing that noticed is that there are quite a few unpainted bodies for sale, which I don't recall seeking when I last looked. Most were listed as original. Hmmm... maybe they are all legit, but there's quite a few. When a bunch of something like this (high cost, tough to distinguish, material-wise, no SN, etc.) it makes me wonder.
Anyhow, I digress. It's an option.