Amazing cheers all!
I kind of ended up running with more of a Barry-H approach (4 outer spheres, and a revolve curve running into the center...) but then went a bit mad with the workflow. Yes the thing with SubD is it's always a guessing job (for me at least.)
Went with:
MoI OBJ (which was fine, really) > Houdini VDB to Polygon conversion for reliable re-mesh > 3D Coat for smoothing, bit of slight 'organic' surface imperfection...
I'll have to check this biconcave script!
- Rich

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