Good work. If you have this level of detail for ships you "despise", I'd like to see you try out a ship you actually like.
And I'm one in favor of Starfleet having built ships in batches over the years with relatively minor exterior modifications. There's plenty of precedent in real life; the ten Nimitz-class carriers were launched from 1972 to 2006, over the course of 34 years; the Gerald Ford class carriers that will replace them will be built over an even longer period of time. The first Arleigh Burke class destroyer hit the water in 1991 and the class is still being built in the US (with variants built in Japan and South Korea). And the F-4 Phantom was built from 1958 to 1981, with examples of the plane still flying in air forces around the world.
Plenty of reason to believe that Miranda class starships were built in several batches (or "flights" in US Navy parlance) as the need arose. they would be outwardly similar in appearance but the innards could be significantly upgraded with each batch, and to older ships of the class if need be. The aircraft carriers Intrepid and Midway are two examples of old ships that were rebuilt several times over their service life despite having the same basic shapes (angled flight decks nonwithstanding). So, the Brittain could have a relatively modern bridge despite being a module plugged into a hull that was 40+ years old.
In any case, it's still a great summary of the models' usage over the years. Hope you do tackle the Excelsior class at some point. Maybe you hate it, but it's one of my all-time faves mostly BECAUSE it's been seen so much.