You’ve stumbled across the answer in your own question. The hand choice is arbitrary, and the direction is a binary choice between the galactic plane looking clockwise or counterclockwise. So you’ll get an even mix of upside-down and upside-up ships when you choose that normal direction arbitrarily.

Good point, I wasn’t considering production.

Per kilogram-meter of cargo transported, container ships actually have some of the lowest emissions of any form of transportation!*

Other than electric vehicles that were charged by zero-emission sources of electricity

“It just works”