The Centaur website says, "unique orientation of fiberglass set in an epoxy matrix." Is it just G10 fiberglass? Thanks for any input!

Thought you were in the wrong place when I saw the question!

Sounds more like a cosmology question than archery.

G-10 would be my guess but, only a guess.  Years back Binghams used to carry a product called powertuff, which was used to make compound bow limbs.  That might be something similar bet a call to Binghams might prove informative.

My guess either G-10 or glass carbon mix. I would just like to see the steps Jim goes thru to create this system. Looks really solid.

you can buy the material in block form from I believe Old mastercrafters or Dale Dye

You can buy it from Dale Stahl..  Its not a solid block.  
You form a block out of 1/2" thick individual layers.  
It ships in 1/2" thick X 48" long X (x)wide Slats.  

It makes a really solid riser.

Thanks for all the input, I really appreciate it.