Re: Spine structures
I'd use subdivision. Here's a quick (very) example I just made from three blocks, stretched and then some of the vertices moved. Some of the ends were squared off by doing a zero distance extrusion. The object on the right is the same object without subdivision.
Obviously, you'd need to spend some time making the 'flat' shapes before subdividing and bending them. You could make the 'spines' using flat 2d meshes and then using Object->thicken to turn them into the 3D grid shape.
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