Okay, I pulled out the NG (since that seems to be the medium you built this ship from...you really should pick up Starships). Aside from the fact that I disagree with the idea that Starfleet (even a post-DW Starfleet) would build pure warships (i.e., Battleships, Dreadnoughts and Destroyers), I have a problem with the design:
Length/Height/Beam -- 225/85/90
Okay, as you wrote it, length fits a size 5, beam fits a size 5, and height fits a size 6. How can you justify calling this ship a size 8, by any stretch of the imagination?
Also, even as listed, your "fast battleship" would have a minimum of 17 decks...that means your crew complement should be at the very least 255. If you want to make the ship heavily automated, then, maybe, you could get away with 200. But 80? That's way too low, IMO.
Aside from that...your design is sound, point-wise, for a size 8 ship.
Davy Jones
"Frightened? My dear, you are looking at a man who has laughed in the face of death, sneered at doom, and chuckled at catastrophe! I was petrified."
-- The Wizard of Oz