The next step is to install places for your crew to live and work. The basic equipment spaces includes a bridge (with stations equal to half your vessel's Linear Value, to a maximum of ten), but all other spaces will need to be installed separately.

A warship will require a number of crewmembers equal to its Area Value (rounded up), and many ships will carry a few extras. Of these, ten percent—possibly more—will be commissioned officers, and another fifteen to twenty percent will be non-commissioned officers (traditionally called petty officers in naval service). The remainder will be enlisted crew. These numbers assume that the warship is running a watch-in-three (that is, each crewmember spends one-third of their time working, and two-thirds off duty). For a watch-in-four, which is usual only during wartime, increase the total crew complement by 25%.

A military vessel might also carry Marines. In some militaries, these Marines also make up part of the ship's damage control teams; in others, the Marines have no shipboard duties. If your ship will carry Marines, it will likely carry between 25% and 50% of the ship's total crew complement as Marines. This is in addition to the required Navy crew. Marines will have similar percentages of officers and non-commissioned officers, but often have a very different rank structure.

Civilian ships require far fewer crew members. This is partially because civilian ships do not require tactical departments or damage control, but also because civilian skippers are more willing to rely on automation. The crew requirements for a civilian ship are equal to its Area Value divided by four (still rounded up, so a minimum of one).

Small craft frequently do not carry every crewmember they need aboard, preferring instead to leave many crewmembers at base. This makes it more difficult to repair a small craft while under way, but is more economical, both in terms of operating costs and in terms of cubage aboard the vessel. Divide the crew requirement for a small craft by three (still rounding up, so still a minimum of one).

Select and add any number of the following crew spaces to your vessel. Total the volume consumed by all these spaces.

Divide the total volume of crew spaces by the vessel's Slot Volume. This is the number of slots consumed by the ship's crew spaces. Round fractions up, since you can't install partial slots of equipment—and you might choose to double back and add some more facilities, to fill out any partial slots.

Bunk: This is just a place to sleep and to store a foot locker, nothing more. Most crew will only be at their bunks while actually sleeping. Note that you can get away with installing only half the bunks you need, as military personnell are used to “hot-bunking”—sharing a bunk with another rating on a different watch, since they won't be sleeping in them at the same time.

Cabin: A standard cabin can include one or two beds. Non-commissioned officers and junior officers will often share a cabin, though at least they don't have to hot-bunk. On smaller starships, senior officers might use this size of cabin as well.

Large Cabin: With twice the cubage, these cabins are rarely installed on anything smaller than a heavy cruiser. As with regular cabins, they can include either one or two beds. Senior officers might share a large cabin, but the ship's CO will often have a large cabin to themselves, which also includes the captain's office. Paperwork, after all, is the real fuel of every Navy.

Mess Deck or Wardroom: Seating for enlisted men or for officers to dine. The mess deck will often only be able to seat 20% to 25% of the enlisted men at one time, whereas the wardroom will typically seat 50% to 100% of the officers at once. On larger ships with lots of Marines, it's not uncommon for the Marines to have their own mess deck and wardroom.

Recreational Areas: A bored crew is an inefficient crew, and so every ship will carry some way to help a crew relieve the tedium of space travel. Recreational areas will also often serve as briefing areas or training rooms.

Sick Bay: A proper sick bay is normally found only on military ships, or large passenger liners. It includes a number of diagnostic tools, a pharmacy, possibly one or more operating theaters, and quarantine berthing for ill or injured crewmembers or passengers.

Flag Bridge: This facility allows a flag officer to exercise divisional or squadron command. It is essentially the same as a normal bridge, though with six stations and a large plotting table.

Combat Information Center: Tasked with operating sensors, managing threats and making information quickly available to the skipper, a CIC is vital for any warship. It is essentially a four-station bridge, and is typically placed adjacent to the main bridge.

Auxiliary Control: This is a redundant copy of the main bridge, installed elsewhere in the ship in the event of the main bridge being disabled. It is typically one station smaller than the ship's usual bridge, to a maximum of eight stations.

Food Storage: This includes not just food, but also water and a small supply of oxygen (to replenish that lost due to lock cycling and the like).