The Imperials, with their tall bridge tower, did exactly the same thing.
Why do people keep saying the star destroyers weren't in gravity? They were. The whole premise of the battle requires the planet to be right there.
I think the idea was that the poster thought they were in orbit- "free-fall" hence behaving as if they were in zero gravity. But, I don't think that fits - the shield is far too close to the planet for the battle to take place in geostationary orbit (where ships would be stationary relative to the planet's surface).
The main hull (so the not bridge, which is basically a scrotum, who seriously designs a ship that begs to be kicked in the nuts?) looks like a large version of the nebulon's bulky front but (without its column of stuff.) both look like they have oblongs encased in armor that doesn't cover the front bit.
Profundity MC75 from Rogue One Visual Guide
Nebulon-B:
http://www.starwars.com/databank/nebulon-b-frigate
There's similarities - but not enough to justify retconning the Nebulon-B as a Mon Cala design.
