Nice! Let me know if it works!
Sorry, I didn't take any pictures while I had it all apart. And I don't have time to tear it all apart again. All I did was remove the fuse box, and pull the the wire that goes from the starter relay, down to the starter. It's a 12ga wire, yellow, with grey stripe. I just wired it to a switch in the cab. Pretty straight forward. When you pull your fuse box, you'll see the yellow wire coming out of the - I think - grey connector, directly under the starter relay.
It needs a 12 volt supply, to activate the solenoid on the starter. You could also just disconnect that yellow/grey wire AT the starter, and wire your switch from there. I didn't because wanted to leave the stock connector attached to the starter. I also want to be able to revert back to stock. If you're not concerned with doing that, you can cut and wire any way you feel like.