OK, the disproportionate bulge was due to a stray holdover number.
Now I can't for the life of me figure out what that flaw in the uv-mapping is
due to.   I've been over it all a dozen times.  Replaced patches B and E with
code copied directly from the other unflawed patches.
It's always _something_.

Still not sure exactly why my interior and exterior textures are reversed.
(The blue & red grid is the interior)
Tried reversing my uv vectors so they went counterclockwise, and that just
turned the map, didn't invert inside/outside.

Getting close, though.   Getting very very close.

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