I did try to mess with the edict before, though a vanilla ship section appeared. Instead of the model so messing with the edicts got put on the back burner till all of the current ship sets are set up.

No idea how hard it would be and as said before you might have already something better in mind. In any case great idea, will definitely have it active every time I want to use the sw shipsets !
(sorry for the multiple part comment, was too long for just one)

A bit curious about your plan for shipset compatibility. You probably a better solution already but maybe having empty sections (a section with no visual) for area where other shipset apply their visual and yours don't to prevent overlap. Like it is currently the case with the empire trait alongside the star wars shipset on the battleship size. (so as an example you have the battleship broadside middle section that display a rebel ship and a broadside middle section that display nothing so you don't have overlap, if that makes sense.)
It could be something optional that you can grab if you need it through an edict (like some of the additional ship part of sw shipset).

Hey,
Great mod idea being able to run several ship set is basically a dream come true. There are still some works to do but you definitely deserve a praise for the work already done.