I'm confused by the Upgrade button. I would assume that it would give me the exact ship that I had selected when I clicked Upgrade. Instead, I seem to always get the unmodified base model without any additions. After I've spent a bunch of time tweaking a ship design I would prefer to not re-work all of the components but for instance, just upgrade the guns. Is this possible or do I always have to start from scratch? Am I doing something wrong here?