You have to redesign.
All non-jewelry is removed when you upgrade a ship design in the 1.1 beta, so it's a lot easier to go from mk 1 to mk 2 to mk 87.
Before the beta, I'd make a jewelry-only hull template and prefix the design name with ~ to make it show at the bottom of lists.
So I'd have the base ~Constructor that would be upgraded to Constructor Mk I, Constructor Mk II... Still do that, actually. Hm.