Since nobody came up with an answer, I thought I'd go ahead and record 
what I discovered, just in case someone else has this problem down the road.

The image was rendered with an orthographic camera.  After reading the 
documentation, I was under the impression that most of that was 
controlled by the up and right vectors, as opposed to the location.  (As 
a side note, I still don't completely understand the up and right 
vectors... perhaps someone could spend a little more time on them in the 
next release of the documentation?)

Long story made short, I put the camera inside the length of the 
nacelles, which resulted in me getting a cross-section of them at the 
plane of the camera, which was, naturally, dark, because no light 
penetrates to the interior of the object.

Placing the camera further back gave a nearly identical image, because 
the up and right vectors controlled the size of what was in it, but with 
the full nacelle, which was properly lit.

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