Finished fabrication of the aftmost end of the battery cables....nothing special about stripping, threading a nipple, shrink tube, and using a hydraulic crimper for the number 2 awg. Connected the ground, but not the positive; in fact, taped over the battery positive...want to be sure of "loose wires ?" before I put power to the system. Then went through the TWTT step 5300 (fuselage wiring) again, page by page to be certain, and discovered a tiny note about connecting an elt ground wire directly to the battery across from it. Otherwise ok. Spent a modest amount of time inspecting the wiring in each wing's tips. There's nothing complex about these simple steps, other than the physical gyrations required while working behind the bulkhead when hunched over standing outside through the small baggage door. Glad to complete this step, although I'll still need to eventually crawl in there to secure the cables aft to/from the tail.