when its about the size - one must make a great difference between a military grate ship where people are just able to work and sleep and eat ( basic needs ) .. or where people are able to live a normal life in relative comfort.
you one might expect as many crew members and people working on a BHG mako which is rather tiny as there are on a zoner juggernaut. - the difference is... on the mako, each cabin holds 6 soldiers, each one having a little trunk, a narrow bed and a pin up poster on the wall.
in the juggernaut, you have a whole family living in a generous 6 room apartment with a nice patch of garden in the biodomes and a great amount of relaxation and distraction facilities ( no, not like a luxory liner, but you need such things when you consider it your home )
additionally - even such trivial things like corridors would be much larger in a juggernaut so there s no feeling of being squeezed into a "spaceship" but rather a platform that just happens to be in space but has more the characteristics of a normal city building. in military terms - the juggernaut would surely "waste" a lot of space. - but that also means that ... if really NEEDED, you could probably load several thousands into a juggernaut in an immanent emergency. just like you can put hundreds of people into a training hall or thousands into a stadium.