I play the 1.12.2 version of the game, and the mod appears to be absolutely broken. Once you assemble the ship, it will just shake and move nowhere, turn on its own, move into the terrain and get stuck there and randomly accelerate. I have tried tiny ships (3x6), and mediocre ships (5x11), and it absolutely sucks. No matter what I do, the only way the ship moves is like a jackhammer...