I have one. Pretty nice machine. It has thicker castings and a different Z than most since it uses a rack and pinion. Column has another bolt and a nice thick web/wall around the base where the column bolts to it. Thicker table and more webbing there as well. You have to be a little more creative when converting it.
look at skinnerranch.net and scroll down to the RongFu rf45 pages.
Richard