Dual launch tube tend to make a ship look fat, which is, personally, my main reason why I dislike it. (As to why did I use such a design on my own ship, I have no idea... it sounded good, back then...)
I would also not suggest an extended hangar bay below - I can only imagine it doing the same obesity look to a ship. Instead, I'll suggest a hangar that would be "inside" the structure of the ship. Much like Star Destroyers (hangar in belly) or Federation Dreadnought (hangar one side to another) from Star Wars