-concerning the tower: because the ship is built so that both up and lower sections are thin, a mushroom bridge would either be ridiculously small, either really look like a mushroom to fit in.
-no I havent tested the size comparison yet, I will do so in a moment.
-I'm not sure what shelves are you talking of, but if those are what I think you are talking about, they are for turret mounts
-I thought about a dome... but... the thinking of a balloon in the back is somewhat funny lol
-I posted a pic of the hangar above, check it out
-I was thinking either it is; a big spotlight for no reason, a static missile port, or a radar system...