Hi there sc2ggamer,
Right off the bat I can say that the distortions of the mesj (flying off screen) have most likely something to do with the weight attachment to the bones of the armature. From the look of it vertices aren't painted to a bone in at least some degree making them "unallocated".
See attached image, the marine shield is weight painted (red coloring) to bone "Shield" <-- case-sensitive. Vertices that aren't weightpainted are blue.
As for the textures, make sure the filepath in the editor is the exact same as the one used on the model.
If the texture filepath in the model reads: "Assets/Textures/My_Model_Texture.dds" In the editor you must also import the textures equally. See attachement.
This is what I can say from first glance of your images and explanation. Hope this is useful for you.