I am looking to reside my tired, old press board siding. I found, then lost, information on a real looking fake cedar shake siding. It was not a thin vinyl or a thick cement product. It was more of a thick plastic or fiberglass product that was almost the true dimensions (thickness)of a real cedar shake. I have looked everywhere and ruled out Certainteed, Harvey, products.
Here's two sites to check
http://www.novik.com/polymer-cedar-siding_CEDAR-SHAKE-8
http://www.textureplus.com/cedar-shake-interlock.html
Jack