RJ- I think you are right and wrong on this one. I hope some day that I can show you in person. I suspect all the greens are still Macdonald/Tillie. Rees just improved the visuals and in some instances playability of the course with his wonderful bunkering.
This is the original Mac "short hole" SH #16 The original tee was about 30 yards forward with the shot across the gorge. This tee can be seen in a few of the posted photos. This is a wonderful green, It is almost an inverted saucer which affectively plays about 1/2 the size. Still a difficult up and down but years ago It was very very very difficult. I suspect an CBM original. The grass bunker was a Rees attempt, It wound up looking like Mickey Mouse.
At the top of the photo is a biarritz hole of about 210 playing downhill to another untouched green though it has really shrunk in size. Also the bunkering has shrunk and is clearly evident in person. The swale is not visible but it is fairway length and is at the base of the giant hill. This hole is now on the par 32 lower course.
SH #3 can be seen in the woods near 16 heading se in the picture. This hole plays across the gorge also. I believe G. Bahto recognized this as an EDEN hole. (of course with Rees touches). This green seems to be Tillie to my eye.
SH #7 which is just above the white cut-out in the photo is a reverse redan of 210 yards which plays down a significant hill. This hole still works pretty well and I suspect this green has not been touched.
Still a very fun place to play, the course has really good bones.