I finally started buying suspension parts. I'm using off the shelf big rig parts. They are surprisingly affordable. 4 link bars are $50 each and mount with 1" bolts. I will make something similar to the Ridewell screen shot.
Started pre-mockup to try and figure out frame height. Looks like the limiting factor is how much to not stuff the 255/70r22.5 into the fender. No idea how much wheel travel to plan for on something like this. This is what 5-6" looks like. It is around 5" lower than stock truck sits now. Not "Low", but maybe enough to look good.
If this is the right height, this frame should be super simple. Maybe no touching required up front. Frame is like 20 inches off dirt. Top of axle is at 11 inches. That's 9 inches for suspension to fit. Hopefully this is enough.