Mark,
I have two questions for you. The Jimmie Austin routing, did you put the original routing overlay on that or is that on display at the course? I'm curious because I have a photo of the original routing that they had hanging in the proshop when I visited there several years ago.
Also, on the Southern Hills routings, did you notice how the 7th looked much more like a slight dogleg originally and is now much more straight away? That green used to be further to the left and had a swale short of it. I think they moved the green due to drainage issues at some point, but I have not been able to pinpoint when.
Oh, one more, do you know what changes Heckenkamper made at Twin Hills? Other than 14 and 15, that course really didn't need much work in my opinion.