Jetrock
Banded Mongoose
I think the foldaway toilet from "Serenity" is from a 20th Century sleeper car (19th century Pullman cars had toilets at the ends of the car that just plopped waste directly onto the track, all marked with a sign DO NOT USE TOILET WHILE IN STATION)--I visited a railroad museum in Green Bay that had a very similar folding toilet setup in a 1950s passenger car with private cabins of various sizes. The modern Amtrak "wet shower" (located in the Superliner bedrooms, a step above the roomettes, a shower enclosure with a door and a toilet inside, compact sink and mirror outside for shaving and makeup) is less than a meter square and seems like a good size for a middle-passage fresher.