Both Warren and Jack exhibit their work at the great, annual Denver Gun Show, (which was held a week ago). Jack is a master builder with an encyclopedic mind, and he does restoration every bit as well as he builds. Warren seems to be more restorer, than builder, but did put together the faublous Lehigh gun for himself, to hunt elk.
Jack built a rifle (scaled down some) for his daughter many years ago, and I think that gun has the same fine maple for the stock. It may be shown on his website.
Someone theorized that the figure in the wood may be due to various impacts, such as harsh weather, lightening strikes, and so on. I don't know enough about wood to comment except to say that this maple is truly beautiful.
As to seeing Warren's rifle, check for a website and if he doesn't have one, he may be listed in the Denver phone directory. If that fails, get in touch with Jack since they are good friends.
Dick