Nothing more dangerous than a trans-dimensional ship without railings, and believe it or not the railings for The Due Return were not constructed until the 5th era when Havannah Blue thought the exact same thing.
Havannah offered her services to the crew of the ship in exchange for the opportunity to travel with them. She found out that, in fact, this was how the social dynamic of The Due Return naturally operated. If a person or being wanted to join the ship, all they had to do was join. The more they worked on the ship, the more they got familiar with the crew, the more time they put in, the more they considered the ship their home the more the ship would consider itself the home for them.
Havannah completed the railing witht the skillful help of Deether Commuth, a ‘friend’ who also joined the ship for its journey.