I don't see much point in making Odyssey a double broadside ship. Not only will that make it feel more similar to Conquest (diverse designs are better), but you will still not really want to use both sides. You can't fight with both at the same time, as that requires putting yourself in the middle of the enemy fleet, and neglecting one side to focus on the other will be optimal. Conquests don't have gauss cannons on both sides, do they?
As for the OP's suggestion, the existing medium mounts are placed too awkwardly to be weapon turrets, imo. SWP/Underworld have upgraded Odyssey skins with weapons there, and they feel very clunky to use.