Pat,
From what I have found MacKenzie didn't have anything to do with Red Hill. George Thomas did the original nine holes in 1921 (now the front nine I believe), with Billy Bell completing the second nine in the late 1940's.
I grew up not too far from Red Hill and played there a number of times, but in looking at some of the history the club has, as well as talking with some folks there, I didn't see any mention of Mac, nor did anybody ever mention MacKenize as having a presence there.
MacKenzie did do some work at Redlands C.C. down I-10, but I don't think he ever made it to Rancho Cucamonga.