Paul
I would get the floor supports and floor in place first before tackling the cowl itself. Before you weld the floor/rocker panel (the one across the bottom of the door opening) in place to the hinge pillar, double and triple check the horizontal dimensions of the door opening and the height of the floor reference to the hinge bolts (I believe you can get those dimensions from the FAM - look at Section 1, Sheet 1.07 and Sheets 63.01 and 63..02.) I see that you have the cab braced, which is definitely a good thing.
It might also take a lot of jet fuel to get me there to help, as I'm a little ways from WV.
You might also take a look at my photos on Flickr (the link in my signature.) I've definitely been where you are repair-wise.
Feel free to ask specific questions as you get into it. Good Luck.
