Hello
you can use Dendro, it is an OpenVdb version in Grasshopper. it is there since Rhino 6 so there are many examples. Just take care of the settings as you model is big the voxel size must be similar, here 50. There are aslo may way of smoothing, windows size, type of smoothing, itteration. You can aslo add some mask to not smooth certain parts. …
And if you want clean surface you can use you initial surface to make some clean tools to substract from Dendro smoothing.
I added here some cuts in your curve. Like that some closed curves are cutted and now could be lofted.
rib V0 Dendro.gh (3.5 MB)