Delete everything that is not visible from pilot's seat. And for the sake of Universe... Watch your geometry! Current crash is probably caused by cache generation. Engine just cannot process the geometry like that.
Watch for floating edges and verticles. Watch for interpenetrating faces. Don't delete your stuff like crazy. Use knife tool, and instead of deleting random faces, cut the pieces you want to delete. Use W -> Remove Doubles frequently to make sure you don't have any doubled verticles. Ctrl + Shift + Alt + M will tell you where some of your geometry errors are located. But keep in mind:
Here you see solid piece of mesh. This is a geometry error. If Ctrl + Shift + Alt + M shows you something like that, investigate that part and see if there is something wrong with it. In that is particular situation, there is buggy face below the central element.
This is not error. Just pieces of geometry not geometrically connected to main mesh, but those are still valid pieces of model. You are likely to encounter this situation in model like Banshae due to numerous subobjects.
This is also not an error. Just two mirrored halfs of ship sticks in this spot to eachother.