weld on backhalf with 4 link setup

[Project86]

I've been window shopping around and instead of modifying my existing frame I'm going to drop about 900 on a backhalf unit setup for ladder bars.

What I'm having trouble finding is detailed pictures of where people weld these on. I'm looking at a box frame style backhalf. So how would I tie it into the frame behind the cab??

Reference pictures would help. My truck is an 86 swb. I have an idea of how to do it But not sure where to cut and tie everything in