When loading a Fbx it can happen that there are loading errors, for example a car and only one wheel in the center this would mean that the parts were not assigned correctly in the original creation Program or there just ghosts duplicate Parts in such a case you need to try loading the Model in a appropriate Program try Blender it it gives an error try another one until you get the model right from there export it into an other format ... but as far as I can see your space craft needs a large overwork to end up in a good way into Poser ... at some point even a whole overwork