Update:
I bought a house about 30 minutes south from where I used to live. Been very busy between that and work. I'm still working on the truck when I can. Got a 220v outlet wired up in the garage this weekend so I got a bunch done the past 2 days. A lot of things I've kinda been dreading doing. But they are done!
I got the axle finished, the ends are welded and smoothed, it ended up being 50 3/8" wide. So I think it's narrowed 5 1/8", I can't fully remember the "before" width . I got the frame completely tacked, perfectly square, everything level with each other, I'm very happy with it. The frame is mostly welded and ground down, jus a few more does need to be welded up. It'll be finished in another day of work. I have some cutting to do on the stock frame before I weld the new backhalf in. I want every bit of the old backhalf gone and I don't want to be able to see the stock frame when looking through the bed.
I'm getting the tabs for the 3 link and the fish plates to brace the frame all laser cut so they are perfect.
Here's a few pics of some progress