Amazing game, any clue how to populate custom ships? I managed to build frame for ship (all in creative mode) but I'm having a hard time filling hydrogen tanks and such.
There is a creative command /fillgrids (typed in chat) that fills up all grids(tanks/ammo/energy), more details if you type /help or /heldetailed . Alternatively you can get pouches from creative menu and use them to fill tanks.
Remove the wall(with any tool), extend the hull or build the airlock somewhere else. Be sure to build the airlock on the edge of the ship and at the deck level (not inbetween decks).