Vigilance said:
40 crew UNITS. Not crewpersons. The Crew chapter provides crew rules. Each crew unit is @ 10 people.
In the starship facilities section, you can add passenger facilities to make a passenger ship, and can in fact turn a ship with a lot of cargo space into a passenger liner. The goal of the system was to let people make any ship, and I think we succeeded. 
Yeah, I realized that eventually. But it's tricky, because in some cases, the listing actually is individuals (for smaller ships), but in larger ships, it's a crew unit (it says a crew unit is 5 people)
And the passenger listing is apparently in individuals as well.
It's the combining of the abstract and the actual that confused me. I don't understand why you couldn't just list the individuals for all sizes, less confusing that way.
While I like the idea of the ship design system, I still think it scales up poorly - it only seems to work for small ships.
I mean, why does Huge ship, which is 1300 feet long, have the same amount of max cargo as a capital ship, 5000 feet long? Even if it's just cargo space, surely a ship 3 times as long (and twice as wide) would have some more cargo space. Just by simple logic, it should have 6x as much cargo space
I also don't think you can make any ship.
Take for instance, from Star Wars, the ship Kuari Princess, a passenger liner. It's about like a real world cruise ship, and carries 3500 passengers.
The biggest corporate ship hull in B&S has 100 tons of cargo (and is large sized, only about 300 feet long). The Cruise Suites facilities takes up 15 tons and allows 85 passengers to be carried. If all 100 tons were devoted to Cruise Suites, that would only hold about 550 passengers.
This actually seems about right for a ship that size (about 300 feet long, the Kuari Princess is 1500 feet long). But why can't you let people make a big civilian ship? In real life, the biggest ships are civilian. The only big military ships are carriers.