I suppose the best solution, so that the same type of ships does not breed, is to create drawings and use a virtual vice-rector
If you want to create the same type of work, use a mock-up hangar in which you can create a drawing and a hangar for a 3D printer for your drawings. Using such a printer required a certain amount of resources. It is also possible to cascade such printers to build larger ships.
An important nuance. It is imperative to prohibit the creation of drawings from existing ships, so that other people's work would not be so easy to copy if any ship leaks or someone recovers.
This mechanics will not allow you to discount work the CreateMakers