With the help of Adam Buckner himself and one or two others, I was able to build a replica of the Centaur which is about 95% accurate to the original. If I get some time I'll post pics of it.
And, by the way, it isn't "Centaur class." The ship's name is the Centaur (actually, the name printed on the model is "U.S.S. Buckner," but the script calls it the Centaur), and it's class is unknown. The DS9 Tech manual stated that this and the other kitbashes were just components of regular ships grafted together quickly. However, due to the scaling inconsistencies of the Centaur and the other ships, this is obviously wrong.
And, yes, the CGI model is wildly inaccurate to the original kitbash.