Nice looking fab work, Ben. If I could make a few observations?
1.) The leaf springs are still there, right?
2.) The panhard bar is very short. The bar will push the axle back and forth, crosscar, in an arc not in agreement with the "straight" up and down travel of the leaf springs. This will put a lot of deflection (read as "bind") into the leaf spring bushings.
3.) The panhard bar is at an angle at ride height. This angle will induce more "arc travel" of the rear end into jounce then rebound. You really want the bar parallel to the ground at ride.
4.) The ladder bar front mount is farther forward, in the side view, then the leaf spring front bushings. This will also drive more bind into the leaf spring mounts as the rearend will now want to rotate around the ladder bar front mount as well as the leaf spring mounts.
I do not want to get you upset... Suspension design is what I do for a living so I notice things like this...