Wasn't sure if I wanted to bump this, as this is resolved, but thought I would post the completed project for anyone curious:
https://imgur.com/a/CWTRpz6
Still working on my custom keycaps (Spiderman / Venom, etc). I have a Carnage, Gwenom, and Scream that are unpainted right now. They will be on the far left row (currently F1, F2, F3, F4)
I am quite happy overall with the result of the wiring. Everything is in the open and exposed, with the gold-toned brass wires looking quite blingy.
Thanks for reading!