I started with the section across the condenser to make sure the plastic guides for the core support were spaced right, and although they're exactly the right distance apart, they're slightly too far to the L. I don't think I could have gotten any better if I had measured - there's enough tension on the harness to keep it nearly straight without the supports (which I didn't get right), but not so much that it would tear the tape wrap.
There are now 4 big ground rings at G100 on the core support (just L of top center): the 2 originals, 1 for the e-fans, and 1 for the trunk ground circuit that runs around the engine bay.

The new relay box on the front of the PDB is also for the e-fans, but there's 1 empty space.