Didn't get around to updating last night, but I more or less got my console and new dome light in. One tricky part was that the headliner has a plastic clip holding it from the rear. This clip can be accessed through the cab light hole.
Once I figured that out, I was able to get the headliner down. I found a plug there and at first thought it was for the plow prep/roof beacon before learning it's for a mirror. It's the 16 pin plug with a black, yellow, blue, and green wires. I have a compass/temp mirror from a 400 I was going to put in, but now I'll probably see what other wires I need to use the newer one.
Next, I set my new wiring harness up there and taped it in a couple spots, took some measurements, and put the headliner partway back up.
Based off of my measurements, I cut a hole, little by little, at the front for the console to screw into. Once I found the square factory hole, I was able to put a j clip in to mark and drill a hole for the screw. Then I cut the existing dome light hole out wider to fit the tabs on the console. I used a small piece of trim to give the console tabs a little better spot to slip into. In the write up I followed, it says you can the panel up and the map light section will leave a mark of where to cut the headliner for clearance. I couldn't see much of an impression, so I used a paint pen to mark the high spot and transfer that to the headliner. This is not required, but there will be a little gap on either side of the console without the extra clearance.
All of this took a little finageling to get lined up in the right spot, but I eventually got it secured.
Then I was able to focus on the dome light. Based off of my measurements, template, and some eyeballing, I cut a new hole for the light. This is where I screwed up. I recommend getting an idea where you want it, then taking the console down before cutting anything. I tried lining things up from the drivers seat based off of the console and a not very good view. My light ended up being off centered and slightly crooked. Luckily, the hole was tight enough that I could move it over a little bit, which definitely improved the look. If I did it again, I would take the console out and lean back against the dash to make sure everything was centered before cutting. This gives you a much better, more straight on view.
I still need to do a little work on the console itself, plug my power wire in under the dash, and hook up my ground to a previously installed bus bar. Other than one of the console lights, everything works just fine.