So, I think I've got my wiring figured out. Of course, this is not to scale, and I'm almost positive it'll be much messier once cram-fu'd into the hilt, but this it what I'm thinking.
It's been a while (almost a decade) since I've done any electrical work other than home maintenance, so I'm a little rusty on things. Any advice (and it can totally be the "What in the world were you thinking?!" kind) is much appreciated.