[Fyron]

Go play the demo to see how it works. You can retrofit a ship designed with any set of components to any ship design using any components, whether they are new Versions of old components or completely different components. Well, you have to obey the max 150% difference costs. You can only retrofit from design A to design B if design B's total cost is at most 1.5 * design A's total cost (all 3 resources added together).