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The "rail" is defined by the shape of the yoke and sort of the easiest softest route through the yoke. The circular cross section is ø7mm ID for nice clearance for the cable/hose at the end of the channel the cross section is ø12mm to make it easier to guide the cable through. Using the sweep along rail command gives it this organic truncated look. Which I kind of like. It fits the outer appearance well I think. I've only been using SubD (and T-spline in fusion) modelling for a couple of years, but since we are 3D printing more and more I try to embrace to more organic look logic.
I call it The Cor Yoke as it reassembles a heart/organ a bit.
The 3d printing facility hasn't gotten back to us yet. But if the mini voids are a problem we will probably just make that part solid. They take care of all internal mesh structures anyways
Meanwhile I've been designing this monster of a yoke for Stayer OMGs.