The D'Derix (and any imitators...) is certainly interesting, but I miss the classic Warbird from Balance of Terror too much.
As I said back then, I think the constellation design suffered too much from over-greblification... perhaps in an attempt to make it seem so much like an old, outdated klunker. I think it's rather denigrating to TMP design as a whole to be presented that way, so I very much appreciate your redesign FoAS. Cleans it up and presents it as a contemporary of the TMP ships. Plus it also gets rid of the kitbashed Enterprise pylon struts pasted on the back part of the primary hull... which I find incredibly annoying for some reason lately :\
So, how about the Soyuz?