in order to 'name your own ship', you have to replace the texture(s) with the registry. unfortunately, a lot of modders never bothered providing blanks, and you would have to make the ENTIRE texture or set all over again from scratch or put up with ugly erase marks. you'd also have to locate the assets for making the registry with, like the Fonts in question.
short answer: you have to retexture the whole ship to do that.