That's some pretty good info.
I'm going to say that first you need to decide how well the truck was installed on the frame it is sitting on.
Then are you up to spending the money for the control arms 900 bucks,
http://michiganmetalworks.com/store/...product_id=120
Plus probably another thousand to narrow the rear axle or the effort to hunt a 5 on 5 axle that is the right width. Then add in the cost of bags as the A arms are bag only.
Or keep hunting for another chassis to swap that meets your width and ability to drop needs for a lot less total investment.
It comes down to a "this is what I want, how do I achieve it" thing.