Well, considering the shows always been mostly one big continuity error, I'm actually okay with this design. I personally see the Earth/Romulan War as being similar to the Dominion War, with Earth facing a more technically advanced enemy and having to hurriedly refit and upgrade existing ships to serve until starship production lines can get up to speed. So yes, I can see the ship being fitted with a larger power core to operate more powerful weapons and sensors, and to free up space in the saucer for a larger crew.
Heck, I like it so much that I'm currently working on the model kit version.
More than likely though I'll get rid of the hull mounted dish and do something along the lines of what this person did with theirs.
https://www.flickr.com/photos/29607470@N08/13741771143/in/set-72157643606914624/
Heck, I like it so much that I'm currently working on the model kit version.

https://www.flickr.com/photos/29607470@N08/13741771143/in/set-72157643606914624/