LS Swap - routing all the stuff along and on the frame. wiring harness suggestions?

[Slowguy]

I am trying to keep everything clean and organized by doing it now while everything is off the frame. I'll have to stop on some things until I at least get the cab set back in place but I'd like to stay ahead of it as much as possible.

I routed the fuel lines to the rear tank, air lines to the air bags, wiring to the level sensors, alternator line, battery cable to the side frame mount battery and the rear brake line.

I'm wondering what's the cheapest and most complete option for my main wiring harness (i.e painless wiring). I assume most of these kits are designed for everything factory? I don't want to purchase a $600 wiring kit thinking I need it only to find I'll only use part of it.

I already purchased a ls kit and it includes the stuff to connect to the starter, alternator, all engine sensors and components, fuel pump, trans, and pcm. So I also plan to get a dakota digital speedo and vintage air ac/heat.

As I understand it, (thinking off the top of my head), this means I will need the wiring to all the lights, cab controls, and a fuse center? Not sure I will need much. Figured I'd as to see if someone has something similar and could suggest.