Brent
What does Doak say in his book?
The club's site states:
"the newly formed company engaged the services of Dr MacKenzie . He was commissioned to design and supervise the construction of a new course, which is, with some alterations over the years, the one that is played on today."
There is no indication what those changes were or how much of the original course remains today.
I played there a couple of times about ten years ago. My recollection was it was an OK course but nowhere near the same league as nearby Ganton. If you were after an unaltered MacKenzie course you'd be better off in Leeds (about 60 miles) at Alwoodley.