Craig Edgmand,
Yes indeed, Johnny Miller is credited as co-designer of the Maderas Golf Club along with Robert Muir Graves. In truth he was involved and had some good suggestions for the course as it was being built.
I was the senior golf course architect with Mr. Graves at the time the planning for the course was begun in 1997 and worked with him, first, on tweaking the routing and, secondly, on all of the associated design detailing, drawings, specifications, contractor selection, etc. During construction I was the project designer and made about 99% of the field visits for our firm, some with Mr. Graves, most without.
Just prior to construction, the owner made the decision to employ Johnny (along with his designer, Fred Bliss), to endorse the course and to provide some design critique. To his credit, he did not merely want to show up on opening day and cut a ribbon and give a clinic but to actually have some input. To that end, he was on site once prior to construction and three times during construction. And, of course, he did cut that ribbon and give that clinic at the opening.
I had the challenge of keeping all of the various designers and owner and owner's rep and construction management firm on track with the overall goal of what we were trying to accomplish with the golf course. I was on-site over 30 times but wished it could have been more, because when a site like Maderas's is taking shape, things move in a hurry and there are many decisions to be made. Mundane things that people just don't think about have to be considered. All of the things that Mike Young talks about on this site, the detail things as well as the big picture design issues.
So, while it is not a Johnny Miller signature course, he was involved, from the beginning as a marketing tool, but then during the job as a valuable contributor to the finished product.