No, ignore him. There is no Default Core file in EAW or OP. There is a file called model.siz in the Models directory, but all it does is resize the display of models depending on class. For example, if you use a Star Destroyer as a CA, it will be about the same size as any other CA in game. The file can deleted if you want really big or really small ships. However, it will not cause a discrepancy between the ship's size and the shields. If I understood your original post, after modifying the model in M6, the ship is resized in game but the shields aren't. That is going to happen if you try to resize a model in M6. As I said before, you must use another program.