PILOT	Required for any starship to move anywhere!
NAVIGATOR	Large ships (over a certain tonnage) can't fly without a navigator
ENGINEER	Required for ships with more than 1 engine module, also advisable on any largeish ship to prevent too many brekadowns and faults developing.
STEWARD	Required for a ship to transport more than 2 passengers at once. Additional passengers require more stewards.
CARGOHAND	Required to transport more than 2 tons of cargo at a time. More cargobays will require more cargohands.

You can reconfigure your ship anyway you like from a wide range of components

ENGINES	The more engines you have the faster your ship goes, but the higher the fuel usage and the likelihood of breakdowns. You can get standard engines, or TurboDrive units (more expensive but faster).
PASSENGER CABINS	You can get 1st 2nd or 3rd class cabins, which earn different amounts of money but cost different amounts. Each cabin holds a single passenger
CARGO BAYS	Standard bays hold 1 ton of cargo, Hazardous bays are reinforced and allow you to carry hazardous or explosive cargo (for mroe money). Perishable modules allow transporttation of perishable foodstuffs, smuggling modules are shielded from scanners to allow you to smuggle illegal goods.
AUTOREPAIR	Breakdowns are a fact of life on all starships, but these expensive units will greatly reduce the problems you see on your ship and keep your crew and passenger morale high.
FUEL TANKS	Extra fuel tanks extend the range of your ship, you can fill them with unrefined, standard or premium grade fuel
HOLODECK	Cheers up your passengers and crew, and allows you to charge more to transport people
SICKBAY	Boost passenger confidence and crew morale, cutting down the chances of a crew resignation
FUEL INJECTOR	Fuel can be expensive, especially for large starships, but fitting this unit will reduce substantially the fuel use of your ship and save you money in the long run.
SHIPS GALLEY	Keep the passengers and crew happy by keeping them well fed with this shipboard kitchen
FUEL SCOOP	Cheaper than a fuel injector system, but only reduces your fuel consumption by 25%