Help with big structure generation

I made a ship and I only want it to spawn the whole ship and not pieces of it. (Sometimes it spawns the whole ship and sometimes it spawns random parts of it)
https://media.essential.gg/f1c80f77-8188-4c03-c56b-eadc0b461100 
https://media.essential.gg/f5a314b2-b93a-474c-6158-086c4cbdd700
https://media.essential.gg/119ac6d5-a362-4a6f-aa6a-afb7df129000