Looks like the hangars are detachable from the command portion of the ship. Love modular design. Perhaps all marine ships of this size use the same type of command ship with different "attachments" for different purposes?
None. You need to have an idea of the setting of the game, to understand why in my concepts do not have guns aimed down. Incidentally this is the only ship at the moment, which has a visual display of guns from below as the plane itself. (just this ship will appear in one of the rollers, which will be shown to the lower part)
it looks very nice, but when I first saw it, I thought that the shuttle bays were actually missile launchers. it looks vaguely similar to the Tiidani missile destroyer from Relic Entertainment's Homeworld. still, very nice concept art; extremely detailed.