He said the statue had been constructed in pieces, and the pieces were now being welded together to form its final shape.
Almost all the pieces had been finished, except for the horse's ears and jockey's boots, which Rook said had to be constructed specially to hold the jockey's weight.
"The weight of the jockey is going to be on his boots because they're going to be welded to the side of the horse," he said.
Rook hoped the statue would be completed and installed early in the new year.
"He's quite confident that it'll be finished before Christmas, so we may be looking at something in the new year," Rook said.
He said it had been a long road to getting the statue completed, but it was nearing its end now.
"It's taken a long time, but we're hoping the end product will be worth it."
Previously, Rook thought the bronzing of the statue would be completed by July at the earliest.
He said the statue had taken so long because the builder had to put it on hold while he worked on other projects.
Once it was completed, Rook said the statue would be transported to Waverley to be put on its foundations.
Work on the foundation would need to begin soon, as he estimated it would take about a month to have the foundation made and set.
"[The foundation]'s about 2m long, a metre deep, and about a metre and a half wide, so it's a substantial piece of concrete."
They would have to make sure the bolts being used to install the statue were in the exact place.
"Hopefully ... it should be hunky dory to put up with all of those kids that will climb on top of it and have their photos taken," he said.