Don't cut off the bridge section - it brings back sweet memories of Space Battleship Yamato, Irresponsibe Captain Taylor and all the old warship like shows.
I suggest grabbing some ideas from Gundam though - those ships had good gun emplacements, if not for the Minovsky effect (radar = pile of useless garbage) they would have p0wned all suits.
Put guns on the lower portion of the ship, as said before.
I LOVE this design - it is merly different from FS Canon, though IMHO it can still enter the FS Universe as a sublight space battleship - ergo a ship built BEFORE subspace drives were common.