That's a familiar sight
...
The original hangers and bump stops from my truck are sitting in the scrap box right now, and I'm building a new set of everything at the moment. It wasn't in as bad shape as your truck, but it was getting there...the real reason was I bent one of the rear hangers.
The only change I would make to your list is NOT to install any additional lift device in conjunction with the 5100 kit. It will damage the upper ball joint, and it will not have the effect on the spring and shock you're assuming it will. I can explain more, in painful detail, if you like
. The 5100 on its own is already designed by Bilstein to do what you're probably thinking.
Or...you can save the poly blocks until after you install the Camburg arms...might work then, you'll have to test it.
Which crossmember are you replacing? The bumper piece, or the X-shaped brace that holds the spare tire?
-Sean