Re: Hard sci-fi adventures?
Too small. The shuttle can carry 8, and it can only stay up for a couple of weeks. Something the size of Skylab seems better for the habitable section, with the engineering being separate.
I'd ditch the railgun. It's only effective at extremely short ranges or against a non-maneuvering target. Missiles (nuclear warheads?) would be much more effective. The autocannons might be useful for point defense if they don't mass too much, but I'd rather take more missiles if I could.
I don't think that the weapons officers ("gunners") would be guiding the missiles, only picking their target and launching them. Also, you don't need to worry about the recoil from the missiles.
By the way, what sort of mission is this ship designed for?