Dave, You are killing me! I want to see this truck SOOOooooooooooo bad! You are getting so close!!!
I think there were 2 different door switches over the years but I am not sure which is which. I know bkilby's 74 Cherokees switches look very different from the ones in my 79. His snap into place (like the ones I link to below), while mine are threaded and held in place by a nut (like the other ones I link to below).
The ones on bkilby's look alot like the ones I had on a Falcon. If I were in your shoes (I had no switches or wiring), I would measure the hole and see if one of these will fit in there:
3/4 inch hole switches
7/8 inch hole
NPD also sells a replacement harness for them you could use for connectors, etc.
Mine look more like this:
Later model, smaller hole
For the under dash lights, Jeep used them all the way up until the mid 90's under XJ, MJ, and YJ dashes. I assume some the AMC cars had them too but have never looked. The part numbers changed over the years because the pig tail changed but since you don't have the wiring, it does not matter to you. You can either clip the wrong connector and put the right one on, or just use a different connector that you like. If you watch fleabay the underdash lights show up often. Just search "XJ Underdash Light" or "YJ Underdash light". I have seen them show up cheaper than these 2 but these are just examples.
One from an XJ
one from a YJ
The covers are the expensive part. Often times they turned brown and cracked which means, when you find the light the covers are probably missing or really expensive. I don't have covers on mine because I like the brighter light of an open bulb (and mine were brown and cracked