No. The only difference between this one and a REGULAR log cabin block, was that some blocks started with a dark center, making the darks predominant in that block, while others started with a light center making the lights predominant in that block. All the logs were the same width. It was the arrangement of the blocks that made the very unique and subtle curves. It is the layout that I am looking for.
Sigh. Thanks for you help. I think I'm going to have to drive myself crazy playing with a dozen or so blocks on my design wall.