I think to create a developed surface accurately in SU, you would need to have a much higher number of facets than the model currently in question has.
You would be better off modeling the curves without triangulated faces. The shape can and should be drawn without them and then unfold will look better. And you can do that without a plugin. That said, you should consider that the chine curves you have now are only approximations due to the long line segments between vertices and you'll need to make allowances when cutting out the sheet material. For a hull like yours I would be more concerned about getting frames at the stations built and then I would spile the planks from the frames. You could use Gregg Carlson's Hulls program to create developable skins. It would also do some basic hydrostatic calculations for you to give you an idea of its waterline at its designed load.
what do you plan to use to skin this hull?