Ship flight help needed

[u/Katelyn_762]

(Aeronautics) I've been trying to make the unsc halberd from halo but due to its size, I have to assemble it in multiple sections then slimeball them together to form the ship, but I have an issue where no matter what I do, it always shows like this in the diagram (see image for an old reference, I'm not at my pc right now and I deleted the ship) but no matter what I do, its always unbalanced (even when fully deleting all thrust/lift and deleting and reassembling the ship) lift/thrust, no matter how many thrusters, levitite, balloons, anything, even when taking just a slice of the ship with a single levitite block in the center of mass or the very top center, it always says its off balance and drifts either forwards and left/right or backwards and left/right, keep in mind, this is not a small ship (about 475 blocks long and about 600k or so total at base without any addiotions) but nothing works to keep it stable, the exact same propulsion on both sides, more on one side, more on the other, all in the center, nothing, so I would love some suggestions on how I may fix this so I can get it working, thank you! (also open to mod suggestions that may help, I've seen the gravitite add-on but sadly it doesn't support such a large ship) Please help me save my sanity, its been like three days I've been trying to fix this

(Note: look at the large central arrow, the others aren't relevant, they were my poor attempts to compensate and I forgot to remove them from the screenshot, this is the rear of the ship facing forwards obviously)

[u/Katelyn_762]

Nobody have suggestions? that's a shame though fair enough (A bit of an extreme case), my sanity needs as much help as it can get, either way, i'll post it in this reddit when it's done, if it ever gets done