[PTTG]

Head, Zero-G (1): This dedicated facility provides two spacious restrooms, with the needed water tanks and filters. It's less a matter of technology and more one of space dedicated to the task, including specialized plumbing and seals needed to ensure a comfortable and sanitary experience. One can even take a full shower in this room. Available at TL7 and up, but until TL9, it only provides one restroom instead.

Head, Gravity (1): An elaborate restroom facility providing an extravagant experience... provided that the ship has some form of artificial gravity. Each system provides two large restrooms suitable for impressing even the most decadent of passengers.

Expanded Airlock (1): Increases the number of airlocks on the vessel by one. The additional airlock has a spacious primary chamber and it also has an external area suited for storage or preparation. Alternatively, it can add 6 normal-sized airlocks.

Interstitial Space (1): Provides open, inhabitable space with twice the floorspace of a normal habitat, but half the vertical clearance. This can be as ordinary as a drop ceiling above an office space, or as odd -- even pointless -- as kilometers of cramped corridors hidden behind secret panels going nowhere, doing nothing. If a ship has at least one Interstitial Space for every 39 other cabin equivalents, the GM may reduce the crew required for the habitat modules. Additionally, posh passengers may appreciate having functional elements of the ship design hidden.

Gestation Chamber (1): For alien races that have a sessile reproductive phase, the Gestation chamber is a climate-controlled room for that purpose, often with extensive protection around it. The room is not very useful for active crew members -- except possibly as a place to relax -- but it does have sufficient backup power and air to maintain a safe habitat for five times as long, provided only the appropriate number of eggs, queens, or broodlings are there, determined by their SM and life support requirements.

Memorial (1): This somber room often has some kind of view to space. Its primary purpose, however, is to provide a place to remember and appreciate either perished crewmates and friends, or to acknowledge and reflect on some tragic event. Crew who have access to an appropriate memorial room may receive a bonus on willpower rolls related to grief. Some cultures, of course, may use alternate forms which less somber and more celebratory, though the function remains the same.

Ley Node (3): A large room with complicated magical dynamics allows the starship to function as a mobile node of a specific magical or psionic network. Practitioners of that field of esoteric study are able to tap into that node as normal. It is possible to strengthen the node by adding additional adjacent Ley Nodes. Especially colossal ships (generally, larger than 1km long,) may have more than one node installed.