Michael,
I was a member there for a few years before a recent relocation to the Dallas, TX area. I have had several conversations with John Harbottle and Josh Bridge (GM) about the designs. There is no proof that Stanley Thompson had any part of the design and I actually had stumbled upon an article one time that had mentioned that A.V. Macan was involved.
The reason there is so much uncertainty with the designers is the fact that there have been two massive fires that destroyed the "Grand Old Lady" which was the original clubhouse and most of the history was lost at that time. The only part of the original country club that remains is the fireplace located in the new wing that was recently renovated.
As for the course, it is pure delight. A old parkland course in great shape continues to "tweak" some things here or there over time. Some may initially think that the course is a very easy layout, but it can play hard with tree lined fairways and quick greens. The more you play it the more you realize how much strategy is out there. There are some major risk reward holes especially when you look at numbers 5, 7, 11, 13, and 14. These holes appear easy on the scorecard but I can not tell you how many times they end up the victor over many great players.