We def need an update on this.
Kelly, I haven't done much with car suspension, but I have built many 4 links in my time. Figuring geometry is no easy task, but its just numbers. I am not certain I like the axle mounts. To me, they Dont need to be adjustable up and down. That's why you have adjustment on the cross frame structure. To me, the mounts aren't loading the square tube in a manner I'd be comfortable with. Also, to keep up/down flex out of the arm, I'd like to see more than 2 bolts where it attaches to the axle bracket. To really simplify that, just make the axle end fixed. No reason to have it adjustable there.