Mark,
I went over to play a couple of days ago and the first thing an enthusiastic Mark Anderson tells me is about this possibility, and who told him. I gave him the GCA website, maybe he'll post.
Copake has some interesting old features, like the berms that cross a couple of fairways, bunkers short of the greens, etc.. I was surprised to learn from Mark that the par 3 17th was originally a par 4 and that the remains of the bunker behind #5 green was an aiming point for the tee shot. That must have been quite a hole as that green is pretty small. He also said the 16th green is not an original. Mark didn't mention it, but there does appear to be an old greensite about 100 yds. short of the present day 18th, it is in the right side rough, about 100 yds. short of the present day green.
Did you guys notice it when you were there?
The routing is interesting, with the back nine ringing the front nine. As you probably know, it was thought that the back nine came later than the front. This set-up leads to quite a few parallel holes that make the course play 'tight' when there are a lot of people there.
Even though we had a wet year the greens were firm every time I was there. They can get very fast and two-putting is not guaranteed. On a couple holes, like #'s 14 and 18, even three-putting is not guaranteed. Mark Anderson has done a tremendous job on the course and it has been in the best shape that I have seen it in over 20 years of playing it, despite the challenge he faces with the drainage.
All in all, a nice course.