Mr Cornish consulted to Crystal Downs in 1984-85, just after I first saw it. With the superintendent, Tom Mead, he painted out MacKenzie-style capes and bays for a bunker restoration. Several years later, an old home movie turned up that showed the course in 1932, with the bunkers more in Maxwell's style. They were subsequently all rebuilt by the maintenance crew in-house.
Arthur Hills consulted there for a couple of years mid-90's when a friend of his from Toledo was club president. I don't believe any construction was done under his watch.
It's still a MacKenzie / Maxwell Course which benefited greatly from being a quiet summer place that none of the members wanted to tinker with.