Michael & Frenchy,

Thanks for the feedback and assistance. I tried Michael's approach - separating the central object and hiding the coincident sections. Worked like a charm.

Also, part of the difficulty and complexity of the vanes' surfaces is that I did a boolean diff on the vanes first, to make sure the curve of the central object was preserved after removing their volume from the central object. This still seems to be a sticking point - I'm finding a lot of micro surfaces and edges I have to clean up, but at least I'm getting closer to where I intended.

Thanks again to the both of you. This community is yet another reason I'm saving my pennies to buy a seat of MoI.