Yes a bit complex with Blender but I'm on the way, Ive looked many advanced modelling tutorials with Alias and I got this intuition but I think I can make a good interoperability between Blender and Moi3d I'm trying to reach the best surface export and import, this also gave me more skill on both subdivision and Nurbs

Single surf more complex surfaces and more problem come out, I need a snap with capability that interact with subdivide surf. but I think with a practice I can make solid from multi split subD patches with different topology and CV a good sewed surfaces below an old test with reduced gap but this has some issues on edges and isn't yet well done. but I'm happy with this new strategy :)

Blender multi subD patches


moi multi Nurbs patches


and sewed surfaces into one but has some issues on edges not perfect


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I've aligned two surfaces better in Blender and I edited with a bevel on edges with G2 continuity, now I'm happy, I have to practice

Blender aligned different patch


points shown in Moi3d


And beveled edge with G2