I'm confused. Why didn't you just use the existing wiring and extend it where necessary? I am planning on doing this and running another cable in parallel with the high beam for spots (or if I do fogs use the existing fog light wiring).
I found it simpler to run new 7 core cables from the old headlight position using waterproof connectors back towards the hinges and then hidden behind a fibreglass panel that i bonded in the clamshell exiting where the new headlights are.
Plus side for me is that there was no stripping of the old loom, no different length cables to extend and tgen tape up. I have 4 waterproof connectors per side (2 at the old headlight position, 2 at the new).
If I have issues in the future it'll be at the easily accessible connectors as the rest of it is brand new continuous cable from the old headlight position to the new one. No stripping back the taped up loom for faults.
At the end of the day, you'll do your car your way and I'll do mine my way. We both end up with the same results.
Piran was asking what people had done.
No doubt he'll take the different methods on board and will work out which method works best for him.