I knew about 1371. I was talking about the mismatched registry between the saucer hull and the side of the bridge tower. (By the way, the side of your bridge tower still says NCC-1600.)
In the SFB Timeline, USS Republic (NCC-1371) was the class ship for an earlier version of the Heavy Cruiser (the YCA from Module Y). After the Constitution was built, the Republic was refitted to match Constitution specs.
What you did with the saucer hull is very interesting. It looks a whole lot like the saucer hulls from the plastic Destroyer and Scout miniatures put out by Gamescience/Zocchi ***WAY*** back when. (On their Heavy Cruiser, the slope from the bridge tower to the edge was shallower and slightly concave.)
One question I have...
Are you planning to stay closer to the Franz Joseph drawings or SFB? (They look mostly the same, but in SFB the Constitution class Heavy Cruiser has four Photon Torpedo tubes in the front of the bridge tower.)