So, I heard back from the factory on the wing wire routing in the fuselage.

It looks like it passes to the front of the main spar by going through the first large opening in it.  Once it's in front of the spar it's easy to get to the center.

Factory photo:

Noting the small opening and the sequence of assembly, I'll have to think about my Molex connector approach to make sure I'm not trying to put large connector through that small hole...